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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Expert: There is a 'thirst for change' in Nigeria
CNN's Isha Sesay speaks to the National Democratic Institute's Christopher Fomunyoh about the surprising results of Nigeria's presidential election.
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Nigeria's historic election 15 videos
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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Expert: There is a 'thirst for change' in Nigeria
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A Boko Haram flag flutters from an abandoned command post in Gamboru deserted after Chadian troops chased them from the border town on February 4, 2015. Nigerian Boko Haram fighters went on the rampage in the Cameroonian border town of Fotokol, massacring dozens of civilians and torching a mosque before being repelled by regional forces. AFP PHOTO/STEPHANE YAS (Photo credit should read STEPHANE YAS/AFP/Getty Images)
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Nigeria's President-elect Mohammadu Buhari speaks after receiving his certificate of return from Independent Nigeria Electoral Commission (INEC) in Abuja, on April 1, 2015. Nigeria's president-elect Muhammadu Buhari today sought to reconcile past differences with incumbent Goodluck Jonathan, extending a hand of friendship to his beaten election opponent. AFP PHOTO / STRINGERSTRINGER/AFP/Getty Images
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Nigerian president-elect Muhammadu Buhari (L) waves in Abuja on April 1, 2015.
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Nigerian president-elect Muhammadu Buhari (L) waves in Abuja on April 1, 2015.
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A screengrab taken on May 12, 2014, from a video of Nigerian Islamist extremist group Boko Haram obtained by AFP shows girls, wearing the full-length hijab and praying in an undisclosed rural location. Boko Haram released a new video on claiming to show the missing Nigerian schoolgirls, alleging they had converted to Islam and would not be released until all militant prisoners were freed. A total of 276 girls were abducted on April 14 from the northeastern town of Chibok, in Borno state, which has a sizeable Christian community. Some 223 are still missing. AFP PHOTO / BOKO HARAM RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / BOKO HARAM" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTSHO/AFP/Getty Images
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