Barack Obama

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U.S. President Barack Obama speaks during the 68th session of the General Assembly at United Nations headquarters in New York, Tuesday, Sept. 24, 2013. (AP Photo/Seth Wenig)

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U.S. President Barack Obama addresses the 68th session of the United Nations General Assembly, Tuesday, Sept. 24, 2013. (AP Photo/Richard Drew)

President Barack Obama and First Lady Michelle Obama pretend to march to music in the Blue Room of the White House, July 4, 2010, before delivering remarks to military families during a Fourth of July celebration. (Official White House Photo by Pete Souza)

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**FILE** Then-Democratic presidential candidate Barack Obama talks on the phone aboard his campaign plane after landing in St. Louis on July 7, 2008. (Associated Press)

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The flags surrounding the Washington Monument fly at half-staff as ordered by President Barack Obama following the deadly shooting Monday at the Washington Navy Yard, Tuesday morning, Sept. 17, 2013, in Washington. (AP Photo/J. Scott Applewhite)

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President Barack Obama speaks about the shooting at the Washington Navy Yard in the South Court Auditorium on the White House complex, Monday, Sept. 16, 2013, in Washington. (AP Photo/Carolyn Kaster)

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President Barack Obama awards U.S. Army Staff Sgt. Ty M. Carter the Medal of Honor during a ceremony in the East Room of the White House in Washington D.C., Aug. 26. U.S. Army photo by Staff Sgt. Bernardo Fuller