Former military ruler and presidential aspirant of the opposition All Progressives Congress (APC) Muhammadu Buhari speaks during the presidential primary of the party in Lagos on December 11, 2014. Members of Nigeria’s main opposition party voted through the night to choose a candidate to challenge President Goodluck Jonathan at next year’s elections, with a result expected later on December 11. AFP PHOTO / PIUS UTOMI EKPEI (Photo credit should read PIUS UTOMI EKPEI/AFP/Getty Images)