Sen. Barack Obama, D-Ill., speaks to the media with District of Columbia Mayor Adrian Fenty, after the mayor announced his endorsement of Obama's 2008 presidential bid in Washington on Tuesday, July 17, 2007. (AP Photo/Jacquelyn Martin)
Sen. Barack Obama, D-Ill., speaks to the media with District of Columbia Mayor Adrian Fenty, after the mayor announced his endorsement of Obama's 2008 presidential bid in Washington on Tuesday, July 17, 2007. (AP Photo/Jacquelyn Martin)
Sen. Barack Obama, D-Ill., responds to supporters chanting his name, after District of Columbia Mayor Adrian Fenty announced his endorsement of Obama's 2008 presidential bid in Washington, Tuesday, July 17, 2007. (AP Photo/Jacquelyn Martin)