Presidential transition of Barack Obama time of their election, President-elect Obama and Vice President-elect Joseph Biden were incumbent U.S. Senators from Illinois and Delaware respectively. In accordance with Article I, Section 6 of the United States Constitution, both were required to resign their respective Senate seats on or before January 20, 2009, in order to become President and Vice President. Obama resigned from the Senate effective November 16, 2008. Initially, it was thought that his replacement would be named by Illinois Governor Rod Blagojevich. Since the term for the seat expired in January 2011, it would come up for its normal election in 2010 with
President of Nigeria became the newly elected civilian president. Obasanjo served two terms in office. In May 2007, Alhaji Umaru Yar'Adua was sworn in as President of the Federal Republic of Nigeria, the 13th head of state of Nigeria. Yar'Adua died on 5 May 2010 in the Presidential villa, in Abuja, Nigeria. On 6 May 2010, the Vice President Goodluck Jonathan was sworn in as President of the Federal Republic of Nigeria and the 14th head of state. On 29 May 2015, Muhammadu Buhari was sworn in as President of the Federal Republic of Nigeria and the 15th head of state after winning