Charles Dharapak

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** FILE ** Veterans Affairs Secretary Eric Shinseki (AP Photo/Charles Dharapak)

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** FILE ** Vice President Joseph R. Biden gestures as he speaks March 13, 2013, at the Montgomery County Executive Office Building in Rockville, Md. (AP Photo/Charles Dharapak)

** FILE ** In this Sept. 6, 2012, file photo, former Arizona Rep. Gabrielle Giffords blows a kiss after reciting the Pledge of Allegiance at the Democratic National Convention in Charlotte, N.C. (AP Photo/Charles Dharapak, File)

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President Obama (AP Photo/Charles Dharapak)

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President Obama turns to wave as he boards Air Force One at Andrews Air Force Base in Washington's Maryland suburbs on Monday, Dec. 10, 2012, as he travels to the Daimler Detroit Diesel plant in Redford, Mich. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney kisses wife Ann Romney after they voted in Belmont, Mass., Tuesday, Nov. 6, 2012.(AP Photo/Charles Dharapak)