Yar'Adua hails from the same Peoples' Democratic Party as former President Olusegun Obasanjo.
On the final night of his presidency, Obasanjo bid Nigerians in a national address "Good night and goodbye. God bless you. God bless Nigeria."
Obasanjo's eight years in office were marked by allegations of widespread corruption and government graft from Nigeria's multibillion-dollar oil industry.
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