Barack Obama

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President Barack Obama and former President George W. Bush greet family members of those who died during the attacks on the World Trade Center at the National September 11 Memorial during a ceremony marking the 10th anniversary of the attacks at World Trade Center, Sunday, Sept. 11, 2011 in New York. (AP Photo/Mary Altaffer)

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Former President George W. Bush, left, and former first lady Laura Bush, along with President Barack Obama, second from right, and first lady Michelle Obama along with others, marking the 10th anniversary of the Sept. 11 attacks, pay their respects at the National September 11 Memorial at the World Trade Center site in Sunday, Sept. 11, 2011, in New York. (AP Photo/Matt Rourke)

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Former first lady Laura Bush, from left, former President George W. Bush, first lady Michelle Obama and President Barack Obama hold hands to their hearts during the national anthem as friends and relatives of the victims of 9/11 gather for a ceremony marking the 10th anniversary of the attacks at the National September 11 Memorial at the World Trade Center site, Sunday, Sept. 11, 2011, in New York. (AP Photo/Jason DeCrow)

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President Obama touches names of the 9/11 victims as he visits the North Memorial Pond at the National Sept. 11th Memorial on Sunday, Sept., 11, 2011, in New York. (AP Photo/Pablo Martinez Monsivais)

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President Obama delivers remarks at the Robins Center Arena at the University of Richmond on Sept., 9, 2011, in Richmond, Va. (Associated Press)

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DON'T USE THIS CAPTION XXXXX DON'T USE THIS CAPTION President Barack Obama returns a salute to Navy Adm. Eric T. Olson, commander of U.S. Special Operations Command, as he steps off Air Force One at Campbell Army Airfield in Fort Campbell, Ky., Friday, May 6, 2011. (AP Photo/Charles Dharapak)

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ASSOCIATED PRESS Five-time defending NASCAR champion Jimmie Johnson presents driving gloves to President Obama at the White House on Wednesday. Mr. Obama honored Johnson and seven other drivers from last year's Chase for the Sprint Cup series.

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President Obama speaks in the East Room the White House in Washington on Wednesday, Sept. 7, 2011. (AP Photo/Charles Dharapak)

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"Giving everybody a shot, everybody a chance to share in America's prosperity, from the factory floor to the boardroom. That's what unions are all about," President Obama told a rally in Detroit Monday following a parade of union workers on Labor Day. He said his administration is "fighting for good jobs with good wages." (Associated Press)

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President Obama waves to supporters during a Labor Day speech at the Renaissance Center, headquarters of General Motors, in Detroit on Monday, Sept. 5, 2011. (AP Photo/Pablo Martinez Monsivais)

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President Obama tries to get a high-five from a young boy after arriving at Detroit Metropolitan Airport in Romulus, Mich., on Monday, Sept. 5, 2011. (AP Photo/Duane Burleson)

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President Obama (center) talks to reporters on the Temple Street Bridge over the Passaic River as he visits areas damaged by Hurricane Irene on Sunday, Sept. 4, 2011, in Paterson, N.J. Gov. Chris Christie stands left of Mr. Obama. (AP Photo/John O'Boyle, Pool)

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President Obama talks with residents of Fayette Avenue in Wayne, N.J., on Sunday, Sept. 4, 2011, as he visits Garden State areas flooded by Hurricane Irene. (AP Photo/Charles Dharapak)

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**FILE** In this photo from Aug. 31, 2011, President Obama speaks at White House in Washington. (Associated Press)

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President Obama greets Hector Sealey (center), safety director for Ft. Myer Construction Corporation, and AFL-CIO President Richard Trumka (right) after speaking at the White House on Aug. 31, 2011, to urge Congress to pass a federal highway bill. (Associated Press)