KATSINA, NIGERIA - MARCH 28:The main opposition All Progressives Congress (APC) presidential candidate, Mohammadu Buhari (L) and his wife Aisha Halilu (R) arrive for registration at Gidan Niyam Sakin Yara polling station in Daura district of Katsina, Nigeria on March 28, 2015. Security has been beefed up as hundreds of thousands of voters are expected to vote in the Nigerian general elections after they were delayed for over a month due to Boko Haram. (Photo by Mohammed Elshamy/Anadolu Agency/Getty Images)
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