Something I noticed studying the 2011 and 2016 general election I noticed the voting power of the 2011 election in the south was lost in the 2016 election
I noticed both supporters from the election remained quite faithful to the both candidate in the two election's only in a few case where Goodluck Lost the southwest vote to buhari in the 2016 election and the middle belt state was shared between both candidate. Like in the case of Abia who gave who Gej a million vote in the 2011 election in the 2016 they gave only 300,000 vote ,Edo vote was shared into halves Kaduna who gave 1 million vote each to both buhari and goodluck ended up giving just a million vote to buhari only. The voting power in the 2016 election saw a massive decline from the 2011 election....
Despite that we southerner's don't indulge in electoral practices we tend to have more voting power than than the north who's voting
Power are mainly from Kaduna kastina and kano now you wonder why the north couldn't put buhari there for that long until Jonathan lost his supporters

First picture 2011 general election
Second picture 2016