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Photo by: J. Scott Applewhite

FILE - In this Aug. 4, 2010, photo, President Barack Obama and Chief of Staff Rahm Emanuel walk to board Marine One on the South Lawn of the White House in Washington for a short flight to Andrews Air Force Base as they travel to Chicago. Obama is making official what has been clear for days: Rahm Emanuel, the relentless enforcer of his agenda as White House chief of staff, is resigning. (AP Photo/J. Scott Applewhite)

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