Caption:Nigerian President Goodluck Jonathan (L) and APC main opposition party's presidential candidate Mohammadu Buhari (R) smile after signing the renewal of the pledges for peaceful elections on March 26, 2015 in Abuja. Security is a major concern at Saturday's vote both from Boko Haram violence against voters and polling stations to clashes between rival supporters. In 2011, around 1,000 people were killed in violence after Jonathan beat Buhari to the presidency. AFP PHOTO / PHILIP OJISUA (Photo credit should read PHILIP OJISUA/AFP/Getty Images)
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