Factbox: The candidates contesting Nigeria’s presidential election
NIGERIA will elect a new president on February 25 to take over from Muhammadu Buhari in a contest pitting the old guard against a third-party candidate seeking to upset the established political order. There are 18 candidates on the ballot, but only three are considered the top contenders. Bola Tinubu, a veteran from Buhari's ruling party, will face off with the main opposition's Atiku Abubakar, a former vice president and veteran presidential contender, and Peter Obi from the smaller Labour Party. Here are some details on the candidates and their running mates. BOLA AHMED TINUBU Tinubu is the flagbearer for the ruling…