For 10 points, identify this office whose recent inhabitants have included Olusegun Obasanjo, the recently deceased Umaru Yar'Adua, and the current holder, Goodluck Johnathan.
Recent aspirants to this post in the 2007 elections include former military ruler Muhammadu Buhari and former Vice-President Atiku Abubakar. A previous holder of this office failed in his attempt to change the constitution for a 3rd term in office and is accused of mishandling $2.2 billion in energy contracts while in office but is now the UN envoy to the DRC. The current holder of this office often sports a black felt hat and sparked controversy for banning the soccer team from international play for a poor World Cup performance and is a member of the Ijaw ethnic group. Another previous holder of this office unusually declared all of his assets and liabilities upon coming into office but was forced to fly to Saudi Arabia for pericarditis treatment, leaving his country unsure of his condition for months until he died in May 2010. For 10 points, identify this office whose recent inhabitants have included Olusegun Obasanjo, the recently deceased Umaru Yar'Adua, and the current holder, Goodluck Johnathan.
Recent aspirants to this post in the 2007 elections include former military ruler Muhammadu Buhari and former Vice-President Atiku Abubakar.
{President} of the Federal Republic of {Nigeria}