Barack Obama

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President Barack Obama, right, walks with Chinese President Xi Jinping at the Annenberg Retreat at Sunnylands on Saturday, June 8, 2013, in Rancho Mirage, Calif. While saying it is critical that the U.S. and China reach a "firm understanding" on cyber issues, Obama told reporters his meetings with Xi have been "terrific." (AP Photo/Evan Vucci)

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Sean and Natalie Guthrie, of Boston, right, take photos of their 11-year-old daughter Leilani Guthrie posing with President Barack Obama, as he and Massachusetts Democratic Senate candidate, Rep. Ed Markey watch at center during a campaign stop at Charlie's Sandwich Shoppe in Boston, Wednesday, June 12, 2013. (AP Photo/Evan Vucci)

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B. Todd Jones, President Obama's nominee for director of the Bureau of Alcohol, Tobacco, Firearms and Explosives, appears before the Senate Judiciary Committee, which was conducting his nomination hearing, on Capitol Hill in Washington on Tuesday, June 11, 2013. (AP Photo/Jacquelyn Martin)

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President Barack Obama is applauded as he arrives in the East Room of the White House in Washington, Monday, June 10, 2013, to speak during a ceremony to commemorate the 50th anniversary of the Equal Pay Act. Obama highlighted the gap in pay that still exists between men and women. (AP Photo/Carolyn Kaster)

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President Barack Obama waves as walks from Marine One to the White House on the South Lawn after returning to Washington, Sunday, June 9, 2013. Obama spent the weekend in California where he met with Chinese leader Xi Jinping. (AP Photo/Susan Walsh)

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** FILE ** President Barack Obama views a math project during a tour of Mooresville Middle School in Mooresville, N.C., Thursday, June 6, 2013. The president traveled to Mooresville, N.C., to promote his "Middle Class Jobs and Opportunity Tour." (AP Photo/Evan Vucci)

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** FILE ** Samantha Power, President Barack Obama's nominee to be the next U.N. Ambassador, listens to Obama speak in the Rose Garden at the White House in Washington, Wednesday, June 5, 2013, where he made the announcement. (AP Photo/Charles Dharapak)