On January 27, 2011, the Illinois Supreme Court reversed a lower court's ruling that had cast doubt on Emanuel's candidacy; the court unanimously decided that Emanuel did not abandon his Chicago residency by serving in the White House, thus affirming his ability to run for mayor. He won the Mayoral election on February 22, 2011, with 55% of the vote. President Obama appointed William M. Daley, the brother of Emanuel's predecessor as mayor, as Chief of Staff to replace Emanuel.