Showing posts with label Psephology. Show all posts
Showing posts with label Psephology. Show all posts

Tuesday, September 30, 2014

Anatomy of a wave

The new BJP government completed 100 days in government a few days back. We have also had a couple of by-polls in between. Much has been written about the Lok Sabha election of 2014 and the persona of its protagonists in the interim and the discourse in the media both formal and social, has long since moved on to the the merits and performance of the new government. Now, four months after that mandate, the decisiveness of which was surprising to most and even shocking to some, is perhaps a good time to peel a few more layers of the onion and try to understand what really happened in the Lok Sabha elections in 2014.

The terms wave (or 'lehar' in hindi) is often used to describe a decisive swing in the pendulum of public opinion in Indian political writing. After 2014 superlatives like tsunami, or even 'tsunamo' have also been used by many (including yours truly). In this post I intend to try to dissect the results of 2014 to understand the anatomy of this phenomenon a little better, what constitutes a wave and how it manifests itself.

In the last post I ended with an analysis of the results of 2014 in the context of elections over the last 60 years. Here's a look at the graphic again.





In terms of the definition we used for a wave, and in that context of a 'wave election' one can see similarities in the result of 2014 to previous ones in 1977, 1984 and to some extent in 1998. i.e. in each of those elections there was a definitive swing in vote share towards a party/formation riding the 'wave'. We know in hind-sight that in each of these elections there were strong reasons (or passions) for the dramatic shift in public opinion. While in 1977 it was a wave of anger against the emergency, in 1984 it was a sympathy wave after Indira Gandhi's assassination and in 1998 it was a culmination of the decade long and fractious Ram Janmabhumi movement as well as dejection with the first experiments with coalition politics




Now if we look at the same picture but this time in terms of total votes instead of vote shares the phenomenon is  even more stark. In each of the so called wave elections the winning party (the one riding the wave) gained significantly in terms of  number of votes, surpassing the maximum they had ever garnered in the past by a significant margin. This is true for the Janta coalition in 1977 just as it is for the Congress in 1984 and for the BJP in 2014. Essentially one of the consequence of a wave election seems to be that the party riding it gains a significant incremental chunk of voters.

Also to be seen is that at least in 1977 and in 2014 the increase in the votes for the winner is not really at the cost of a similar decline for the loser. For example in 1977, there was a surge of support for the Janta coalition, but the congress did not do that badly in terms of the number of votes it secured. If anything it secured a marginally higher number of votes. We see the same in 2014 - compared to 2009 the BJP saw a 100% increase in the number of votes but it was not as if the Congress was decimated. In terms of the number of votes the decline for the congress was less than 10%.

So obviously there is another factor at play here and that is incremental voters (with respect to the previous year). The below graphic shows the trend in the number of votes cast over the years.  Here again we can see the spikes (in terms of percentage increase) in the wave elections of  1977, 1984 and 2014.




It is fair to say that a significant chunk comes from newly registered first time voters, but there is also a fair share of the previously 'disinterested' voters, i.e. voters who did not find it worth their while to vote in the previous election. In other words the increment in the total number of voters  is a function of the increase in number of registered voters (newly registered first time voters) and the voter turnout (increase in which is from previously disinterested voters showing up).  The graphic below shows how both of these have trended over the years.






We can see that the number of registered voters has been increasing through the years at a fairly uniform clip (bar spike in 1989 owing to the reduction of voting age from 21 to 18 and some ups and downs in the 1990's owing to cleaning up of electoral rolls). What is more interesting is the trend in voter turnout where we see spikes in the so called wave elections of 1977, 1984, 1998 and most prominently in 2014.

To sum it up, it seems that the defining characteristic of a so called wave election is the presence of a significant issue (real or emotive) that captures the imagination of the voting population leading to a dramatic increase in voter participation. What is even more interesting is that in all of these elections, it seems that this incremental vote (net new or previously disinterested) has a pronounced impact on the result, significantly adding to the vote base of the party riding the wave.

Now let us come back to the 2014 elections try to apply what we have seen to understand the nature of the wave/tsunami it turned out to be. As we saw in the earlier graphics, the 2014 election was an outlier both in terms of the increase in the number of registered voters  as well as the voter turnout.

The increase in the number of registered voters (at 13.7%) is the highest increase in the last 2 decades. On the other hand the voter turnout in this election, at 68%, is the highest vote share ever recorded in an Indian national election. It beats the high vote shares recorded in previous 'wave elections' by a margin and is a good 10% higher than the 58% recorded in 2009. Together this meant that that there were roughly 136 Million incremental voters in 2014 compared to 2009 translating to roughly a 33% jump. 

It is important to take a minute to digest the magnitude of these numbers. At 136 Million the number of incremental voters in India's lok Sabha election in 2014 was higher that the total number of voters in the last presidential elections of the next biggest democracy in the world (the US). In the domestic context this 136M incremental number roughly equals to the number of voters (2009) in the three most electorally significant states of UP, Maharashtra and West Bengal put together.



 
The picture becomes even more stark when we look at how the number of voters has trended in the respective states(graphic above). A quick look at the graphic below shows that between 2009 and 2014 the number of voters in UP increased by 46% while in the case of Bihar it was close to 48%. In Madhya Pradesh and Rajasthan it was greater than 50%.

What does this tell us? Essentiall that this election was not about holding on to traditional vote bases. It was all about getting the new guys and girls, the incremental voter. This is statement is truer for states like UP and Bihar, MP, Rajasthan, and Gujarat where the increase in the number of voters was close to 50%  though it could be applied reasonably to the rest of the country as well.

It also tells us that just looking at the vote shares can lead to fallacious impressions in this election. To delve deeper into what this means let us take a closer look at the results from UP, which it would be fair to say sprang the biggest surprise in this elections. Lets look at a graphic with the vote shares first.




Simply looking at the vote share percentages might suggest that the the BJP's meteoric increase in UP is a direct consequence of the a steep decline in the Congress and the BSP and a smaller decline in the SP. It also seems that the growth momentum of support that Kanshi Ram and Mayavati had built over the last 5 elections is finally cracking up and even that the BSP's support base is deserting it.




A look at the trend in the number of votes (graphic above) seems to contradict some of this. If we look at the graphic above what it tells us is that the only party losing in terms of the number of votes is the Congress. If anything the SP has improved its voter base quiet significantly and event Mayavati's BSP got marginally higher votes in 2014 than in 2009. The conclusion is simple - it is that broadly speaking it is not as if the BSP and SP's core support base, their loyal voters, deserted them in droves. The BJPs trippling its tally of votes in UP can only be explained by the hypotheses that they were successful in capturing a significant share of the incremental vote in UP.

Lets try to understand the demographic of this incremental voter a bit better. It would be fair to say the a big chunk of it would be late teens/twenty something, first time voters. This next generation of voters has been very aptly described as 'post ideological' by Shekhar Gupta. In other words, born in the late 80's early 90's, this generation of voters is in some sense the post mandal kamandal generation as well as the post liberalization generation. Is it possible that the new generation of OBC/dalit voter finds himself empowered enough to leave the comfort and safety of caste loyalties and anspire for something more. Maybe, but if thats the case then this should count as one of the successes of the identity based politics of the 90's. It would also mean that parties like SP and the BSP will have to evolve with the next generation of voters, just the politics of identity might not do.  This is probably even more applicable to the Congress than anyone else, just harping on the secular-communal line will probably not be enough . When was the last time you met a 20 something voter who identified with the Congress or was inspired by its 'young' leader. As the inimitable Ravish Kumar has pointed in many of his essays, politicians and parties will have to discover the message, idiom and medium to communicate to this new generation of voters.

Which finally brings us to the reasons for the increase in voter participation in this election. A lot of credit for this should go to the Election Commission of India. In the year preceding this election the ECI conducted numerous enrollment drives to register new voters and also created online channels for voter registration. However this by itself cannot explain the dramatic increase in the willingness of  gen-next and the middle class voter to come out of their shell and participate in the democratic process. The advent of social media and the gave an altogether new dimension to the election by providing voters with an active platform for political discourse. We can argue about the reach of the medium but its power as a amplifier/multiplier for a message was evident as early as the anti corruption and 'nirbhaya' protests. There was simmering discontent with the performance of the UPA government, and around the issues of corruption, but it was harnessed masterfully by one side who spoke to the next-gen voter, on their media, and put forward an aspirational agenda which was tailored for them. Maybe this is what the much talked wave of 2014 was all about.

Monday, June 2, 2014

A Tsunami it was..



So it is done, done and dusted. It has been more than 2 week since the results came in, and quite a couple of weeks it has been, a time of celebration for some and introspection for others. The BJP capped its phenomenal campaign with a final tally of 282 seats, in the process making this the first election in 30 years where one party has been able to win a simple majority on its own.  In the last post, I rambled on wondering what kind of ‘wave’ would be needed to drive the BJP to the kind of victory the opinion polls predicted for the BJP. The semantic debate seems settled now, nothing less than ‘tsunami’ would do to explain the upsurge of support that the BJP was able to muster especially in the keys states of UP and Bihar, a tsunami that has shattered many tenets of Indian politics and left several questions in its wake. 
  
While the result has kicked off another veritable tsunami of elation and anticipation on the right it has no doubt left a lot of liberal centrist friends disappointed. The reactions range from resignation to despair and denial. It is the last kind of reaction that I find particularly dangerous because it prevents the kind of introspection that is needed by believers of liberal centrism if they want to remain a political force to reckon with. There have been articles that seem to blame everything from the first past the post system to communal polarization to the BJP's marketing blitz. In my humble opinion romanticizing about proportional representation, blaming the electorate of being naive to (and even being complicit in) the dangers of communal politics or making Dentsu the scapegoat is not going to help. 

Diversity of ideas and thought is the driving force for any democracy and strong left/centrist forces are as important as strong rightist ones for the health of ours. Serious introspection is called for in the liberal/centrist camp, but even before that a humble acceptance of the mandate is absolutely essential. Here again there are a few cases where the denial is almost pathological, like one that called the result 'a stolen verdict'. Liberal thought would do well to pick its 'ambassadors' from the 'cheerleaders'. The intent in this post is to understand the result of this election in more detail and put some numbers around the magnitude of this verdict. 
Let me get done with the basics first. To start with the final tally by party and alliance – ‘mission 272’ accomplished for the BJP, with some to spare, and utter decimation for the congress, the likes of which it has never seen in its checkered history.  
Next on the list is to take a quick look at the regional distribution of the seats, one that we have undoubtedly seen countless times but still throws out a couple insights every time it is re-examined. The graphic below does that and also compares with how it stacks in comparison to 2009.
A lot has been talked about the BJP's sweep across north, west and central India and a picture is worth a thousand words, so i will not dwell on that. Just that it is interesting that the picture for 2014 looks like a saffron surge, with its epicenter in Gujarat and a focused thrust towards Purvanchal has washed through the country only meeting any significant resistance along the southern and south eastern coast.  Even here, the party's performance in West Bengal, Tamil Nadu and Assam, areas which they have not been strong traditionally, should be  encouraging to the BJP and unnerving to its opponents.
On the other hand its not a pretty picture for the congress. Its final tally of 44 is made even more miserable by the fact that  it has not crossed over to double digits in even a single state, i.e. it is not even left with significant pockets of regional influence to show for. In previous posts I have talked about how the urban seats were a significant factor in the Congress's  performance in the last election. This time the congress had to face a rout here - not even a single seat from the ~30 seats in the 7 Metros (including Bangalore, Hyderabad and Pune). Perhaps most galling for the Congress would be its performance in what have long been considered its bastions. The graphic below shows the results in constituencies where the Congress has won 8 or more times in the last 10 elections. 
The losses in Nanddurbar and Sangli, where the Congress has won every election all the way till 1977 (and even in 1977), and urban strongholds like Mysore and Nagpur would hurt and should.

Moving on, lets take a quick look at polygonal contests in this election ( more on polygonality and method used in a previous post

As expected, the elections in Gujarat, Madhya Pradesh and Chhattisgarh were almost entirely direct contest between the BJP and the Congress. Maharashtra threw up a bit of a surprise in the sense that it was largely a 2 cornered contest this time between the BJP-Sena and Congress-NCP alliances. Unlike the last election the MNS (in Mumbai) and BSP (in Vidharba) did not play a significant role (more on the effect MNS had in 2009). Also, as expected wherever there was a direct contest between the BJP and Congress the BJP has made a clean sweep.

A quick look at the margins of victory (below) also shows the gulf between the two parties in Western and Central India (where they are engaged in largely a direct contest)
The next graphic shows the distribution of seats and vote shares across the different states and union territories. 
Once again it shows the gulf in vote share that led to the BJP sweep in north and west India. In MP it is ~ 20%, in Gujarat ~ 30% and in Rajasthan ~25%. In the 3 and 4 cornered contests of UP and Bihar the BJP had a 20% and 10% lead respectively over its nearest opponent. In a first past the post system, a 20% vote share differential, more often than not leads to a complete sweep as we saw this time (as always move the cursor over the graphic to use the interactive features of tableau)

One quick look at the map of constituencies by winning party in 2014 also shows that the the BJP has announced itself in the very frontiers of the country - the northern most constituency - Ladakh, the Western most - Kachchh, the easternmost, Arunachal East and the southern most (doesnt matter if we think it is Kanyakumari or Andaman & Nicobar Islands), have all gone to the BJP. This seems to be the election where the BJP has made the transition to a truly national party - or at least as national a party as there is today. The graphic below shows this a bit more clearly - this is the first time the BJP (or any other party for that matter) has won seats in more states than the Congress has.

Lastly any analysis of an election would be incomplete without a historical context. The graphic below shows how the vote shares garnered by the BJP and the Congress compare with their historical performance. I bring it up towards the end because I believe that in the context of this election comparing vote shares is kind of misleading, primarily because of the huge increase in the number of voters this time. Never the less it is still important to talk about, in terms of broader trends.




















Five thing can be seen right away. 
Firstly the Congress is at the worst that it has been in its history, not just in terms of seats, but also in terms of vote share. The 19% it mustered this time is a good 10% lower than what it had in its previous low in 1998. It will take something radical to reverse this downward trend but all indications are that the grand old party will turn to the dynasty again for salvation like it did in 1998. In itself that might not be sufficient

Secondly, for the BJP, this is the first time it has crossed the Congress in terms of vote share. Even in its previous prime, in 1998, it was marginally below the Congress. Seen together the curves for the BJP and the Congress almost seem to suggest that that there has been an exodus of voters from the Congress to the BJP. Suffice to say now that this would be a simplistic conclusion to make.  

Thirdly, the communists continue on the path of steady decline, one that started around the time they made the 'historical blunder' in 1996, and was only briefly reversed in the 2004 election. With 11 seats between them and a meager 5% vote share they are pretty much at the lowest point in their history (barring the first election in 1951). For all practical purposes they have been relegated to regional pockets in Kerala, West Bengal and Tripura.

Fourthly, the fate of the remnants of Janta movement, the ideological progeny of JP, seems to be in a state of terminal decline. The word socialist is probably inappropriate for this motley group as they exist today, retaining influence only as caste based parties. So what really happened in UP? Are caste equations as an electoral strategy dead? Attempting to understand this tectonic shift in the politics of India's heartland will need more thought, perhaps a separate post.

Fifthly, Many see this election together with the one in 2009 as signs of the retreat of regionalism from Indian polity. I believed that this argument is again simplistic. Even in this election when for the first time in 30 years the country has given a simple majority to one party, the regional parties taken together are only increasing in influence. For all we know, the primary opposition for the BJP in the coming election may be in the form of a federal front. 

To end with, any which way one looks at it, this is a thumping victory for the BJP and crushing defeat for the Congress. There is no point in belittling the 31% vote share, it is still the highest vote share that a single party has secured in the last 5 general elections. And if we think it in terms of pre-poll alliances we would have to go all the way back to 1989 to find a vote share higher than the NDA's 38%. Even Nehru, the most popular congress leader in independent India by far, could never muster more than 48%. His grandson did but even Rajiv Gandhi, with 4/5th majority did not cross the 50% mark- that mark has never been breached. That is how the first past the post system in a multiparty democracy works. Of course, it is not perfect. Of course, It leads to anomaly like the BSP getting close to 20% and no seats in UP, but these are the rules of the game. One can’t give oneself a reasonable shot at winning if one stays in denial of the rules. The Center-left of Indian politics has to set its house in order - but that is only going to be possible if they solemnly accept this mandate, feel the gravel in the mouth, and think about what needs to be done to make a comeback.



Friday, May 16, 2014

Deciphering UP

Results of the elections to the 16th Lok Sabha will be declared tomorrow.  It has been a long and arduous battle, culminating in a crescendo with the marquee contest for Varanasi in the last round of polling. The voting is all done now and as we move towards counting day, Uttar Pradesh, is the center of all the attention. Without even going into the efficacy and accuracy of exit polls all over again, it is almost certain that once again the result in UP will determine who rules in Delhi. This state that elects 80 of the country's 543 legislators has given it 9 of its 13 prime ministers. Its small wonder that the latest aspirant to that position rushes to UP to get the right credentials. But India's most electorally significant state is also its most enigmatic one. This post is about trying to understand Uttar Pradesh better to see if there are any pointers to what is going to happen tomorrow.

To start with it is perhaps good to get an idea of the scale we are dealing with here. UP is the biggest state of India by population and 4th biggest by Area. With a population of ~200M if UP were a country it would be the sixth most populous in the world. Secondly, even though it seems to be a single large swathe of riverine plains extending across the northern part of India, it is pretty diverse in terms of the demographic. Essentially we are dealing with a reasonably complex creature here, and it needs to be broken into smaller, more manageable regions to do any meaningful analysis. The following graphic shows something I have done in a hurry. It is not based on any official source, but rather something rough to give some idea of bearings.



The Doab is the name given to the narrow strip of land between the rivers Ganga and Yamuna the two most prominent features of UP's political geography. This extends all the way from the northern border of the state with Uttarakhand where the two rivers originate to Alahabad where they meet. This is split further into what is called the Upper Doab, or the Jat heartland of Western UP and the Lower Doab (or Doab here) extending from Agra to Allahabad. Rohilkhand is the region wedged between the Ganga and the border with Nepal and gets its name from being hitorically ruled by the Rohilla Afghans of Bareily. Similarly the region below the Yamuna is called Bundelkhand and stretches into northern part of the adjoining Madhya Pradesh. The eastern part of the state is often referred as Purvanchal together with a large part of western Bihar. Awadh is the area around the capital city of Lucknow between Rohilkhand and Purvanchal, this was the area hitorically part of the empire of the Nawabs of Awadh (Oudh). Besides the historical, geographical and demographic context to the way UP is devided into regions, there is also a strong distinction in economic aspects. The western parts of Up for example benefitted from the green revlution much more than the eastern ones and that has led to a significant economic divide between these regions. Needless to say these regions exhibit significantly different voting behavior and thats where we go nex

The graphic below shows the results of elections in UP from 1977 to 2013. Use the < and> buttons to scroll across years or the dropdown to go to a particular year.





As one can see, UP is not a state averse to whitewashes. While in 1977 the BLD wiped out the Congress from UP on the back of a strong anti emergency sentiment, The Congress did the same in 1984, winning all but two in 1984 (Etah and Baghpat which to this day remain agrarian/socialist strongholds). What seems to be interesting though is that since 1989 the contest has got more and more quadrangular, with the BJP and then the BSP emerging as strong forces in the state. Consequently we can see this in a four way split of the seats between the 4 main parties. Also 1998 was the closest that UP has come to a one sided result in a while and in the last 4 elections there has been a convergence in the vote shares and seats won by various parties.(notice funnel shape in vote share graphic below).




Also worthwhile to note is where we ended in 2009. The 2009 election saw as clear a 4 way split in terms of seats as UP has ever seen. Even though the BSP was not the largest party in terms of seats, it did end up with the highest vote share (rather comfortably). At 27% the BSP's voteshare was a good 10% higher than the BJP and Congress and 4% higher than the SP. However even more interesting is the gradual consolidation across 5 general elections that this culminates in.  This looks like a base that has been gradually built over time something that might not be very easy to blow away with a wave. The vote base of the Samjwadi Party seems a little more fickle, but only a little. If the BJP has to get to levels anywhere near to where it was in 1998 and what the opinion polls are predicting, it has to increase its voteshare by a whooping 20%. As in much of the country the BJP would be hoping that at least a part of it would come from the Congress voteshare (say 10%), but that itself is not going to be enough. The BJP will have to make a significant dent in the well established caste coalitions of the SP and BSP. There has been some debate around 'wave' and 'tsunami', if the BJP has to get back to 40% voteshare and 50+ seats, it better be a tsunami because a mere wave wont do. I will try to explore a bit more about where the remaining 10% is going to come from.




The graphic above shows the regional distribution of seats between various parties in 2009. We can see that in 2009 the Congress put up a very credible performance to emerge as a force in Awadh whereas in the Doab region the SP continued to maintain its stranglehold winning 6 of the 9 seats (this includes traditional SP bastions like Mainpuri, Etawah and Kannauj) . The BSP turned out with its best performance in western UP and Purvanchal (where the spoils were almost equally split in 3 and 4 cornered contests, many of the quiet close- Graphic below)




One more thing that I tried to look at was what are called bastions. Or seats that some parties seem to win with reasonable frequency. One could follow with the argument that if a party Wins often from a seat and if the margin was particularly large in the last election, chances are that they would retain it. To look at this i looked at a 3 election horizon (and tried to find seats where one party had won twice or more) and a 5 election horizon (and tried to find seats where one party had won thrice or more) The results are shown below. 




In the 5 election horizon - the BJP shows up with 20 seats where it has won more than 3 times. Interestingly a majority of these seats are concentrated in western UP and Purvanchal apart from a few urban centers like Lucknow and Bareily elsewhere. Lucknow and Gorakhpur are 2 seats that the BJP has won each time in the last 5 elections, true bastions. Not even Banaras qualifies for that distinction.
In the case of SP there are 17 such seats. Their strength in the doab is reflected in the strongholds like Mainpuri, Kannauj and Etawah. Kaiserganj, Mohanlalganj (in Awadh) ,Jalaun (Rohilkhand), Balia and Phulpur are others that are less widely known.
In the case of Congress its the usual Amethi, Rai Bareily, Pratapgarh, Kanpur, whereas in the case of the BSP they have a couple of strongholds in Purvanchal (notably Akbarpur) and few in Awadh. To note here is the fact that the BSP is a late entrant and hence seems to be under represented in the 5 election horizon.





The case of BSP was the reason for looking at the 3 election horizon separately  (which has a higher recency effect and in the case of the BJP a higher dose of reality). The big change between the 5 election and 3 election horizons is the viibility of the BSP as a force in northern Purvanchal of late, as well as emergence of SP as a force in southern purvanchal. The good news for the BJP is that they still seem to be retaining their strength in western UP, even in the more recent 3 election horizon.

So where does all of this leave us in the context of our original question on what it would take for the BJP to make it to the 40% vote share, 50 seats mark in UP.

Lets start with Western UP. It is the only region in UP where the BJP was still number 2 in terms of voteshare (having been relegated to 3 and 4 in other regions). Also to keep in mind is that if we included a part of the RLD (part of NDA in 2009) to the BJP vote share it gets even better (though still 3-4% behind the leader BSP). To start with western UP seems to be the BJP's best bet to get back in the game in UP.  If the BJP can take away 6-8% from the Congress and supplement it with a base among new first time voters (which will be a significant factor this time) they have a good chance of winning western UP without making a significant dent in the base of the BSP and the SP. The recent riots and resulting polarization will also play a part here.
In Rohilkhand - a similar scenario presents itself here, with the difference that the difference between the BJP and the leaders SP, BSP is lower at about 5%.. So if the BJP could increase their vote share by about 10% points taking from the Congress and gaining supplementing with new voters, it still barely gets it slightly in front the leaders. To get back to levels where it was in 1998 (37%), it will have to make a severe dent in the bases of BSP and SP.
Moving on to the Doab, here the BJP is more than 22% behind the leader SP. One wonders whether even a tsunami can make a dent for the BJP in this Yadav heartland, where seats like Mainpuri, Etawah and Kannauj elect the SP with heavy margins in election after election. 

Awadh is a slightly different case. Here even though the BJP is behind the leader by 20% (like in the Doab) that leader happens to be the Congress in this case. After Western UP this seems to be another area where the BJP would be looking to make some serious inroads. It needs to be noted though that even if the Congress seats and voteshare seems to be up for grabs the same cannot be said about SP and BSP which have some notable bastions in this area (Mohanlalganj and Kaiserganj for SP and Sitapur, Misrikh for the BSP)

Lastly to the largest and most important one, Purvanchal. Here the BSP has established itself as a significant force in the last two elections, With highest vote share (still only 27%) and joint highest number of seats. Most of Purvanchal saw 3 and 4 cornered contests some of them very close. The other interesting  point is that the BSP seems to be the only party which is strong across Purvanchal (in 2009). The SP seems to be stronger in Southern Purvanchal, while the Congress was stronger in the northern part and parts bordering Awadh.

To sum it up, If the BJP has to get to 50 seats (36-38%) vote share in UP, it has to sweep Western UP. To add to it it has to literally replace the congress in Awadh and make severe dents in the BSP's vote base in Purvanchal, to get ~2/3 of the seats in both regions. BJP will have its biggest challenge, and a worthy challenger in the form of Mayavati and BSP. It will be difficult, bordering on impossible and if they can pull it off, nothing less than a tectonic shift in the politics of UP.