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Boxes of election materials including ballot papers are seen at the Independent National Electoral Commission (INEC) offices in the oil hub of Port Harcourt on March 26, 2015, ahead of March 28 presidential elections. Campaigning wound to a close in Nigeria's presidential elections on March 26, with the two leading candidates delivering their final messages to supporters before the crunch vote. AFP PHOTO / FLORIAN PLAUCHEUR (Photo credit should read FLORIAN PLAUCHEUR/AFP/Getty Images)

Boxes of election materials including ballot papers are seen at the Independent National Electoral Commission (INEC) offices in the oil hub of Port Harcourt on March 26, 2015, ahead of March 28 presidential elections. Campaigning wound to a close in Nigeria's presidential elections on March 26, with the two leading candidates delivering their final messages to supporters before the crunch vote. AFP PHOTO / FLORIAN PLAUCHEUR        (Photo credit should read FLORIAN PLAUCHEUR/AFP/Getty Images)