Nigerians will vote in what is expected to be one of the country's tightest presidential races ever on Saturday, with a festering insurgency and rampant corruption high on the agenda.

The election, delayed for six weeks while security forces attempted to subdue the armed group Boko Haram in the country's northeast, will be the fifth since Nigeria returned to civilian rule in 1999.

Al Jazeera talks to US Ambassador James F. Entwistle, who is in Nigeria's capital Abuja, about the possible outcomes of the election.

Source: Al Jazeera