NIGERIANS will be heading to the polls on February 25 to choose a successor to President Muhammadu Buhari, who steps down after two terms in office. He will hand over to one of the 18 candidates contesting for the position - though only three stand a realistic chance of winning; Bola Tinubu (70) of the ruling APC, Atiku Abubakar (76) of the Peoples Democratic Party (PDP), and Peter Obi (61) of the Labour Party. Nigeria's election body, the Independent National Electoral Commission (INEC), has a duty to deliver the next Nigerian president through a free, fair, and credible process. Except…