President Barack Obama applauds as outgoing White House Chief of Staff Rahm Emanuel announces that he will be stepping down to run for Mayor of Chicago, Friday, Oct. 1, 2010,  during an event in the East Room of the White House in Washington. (AP Photo/Susan Walsh)

Photo by: Susan Walsh

President Barack Obama applauds as outgoing White House Chief of Staff Rahm Emanuel announces that he will be stepping down to run for Mayor of Chicago, Friday, Oct. 1, 2010, during an event in the East Room of the White House in Washington. (AP Photo/Susan Walsh)