Peter Obi, 61, is running for the little-known Labour Party in an attempt to break up the two-party system that has governed Nigeria since the end of military dictatorship in 1999.
Although he was a member of the PDP until last year, he is seen as a relatively new figure on social media and among portions of Nigeria’s young, particularly in the south.
From 2006 to 2014, the wealthy businessman was governor of Anambra State in south-eastern Nigeria.
His supporters, known as “OBIdients,” contend that he is the only candidate with integrity, but his detractors argue that voting for Obi is pointless because he is unlikely to win.
Notably, if Mr Obi wins, he will be the first Igbo president in Nigeria in decades, the last being Nnamdi Azikwe in the 1960s.
