Video - President Buhari, 78 others in the fray for Nigerian polls

Campaigning has begun for what is expected to be Nigeria's most expensive presidential election. A record 79 candidates are in the race, including the incumbent President, Muhammadu Buhari. But his hopes of re-election are threatened by criticism of his handling of the economy and the war against Boko Haram. The Nigerian presidential election will be held in February 2019.