Charles Dharapak

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney kisses his wife Ann as they take the stage at a Virginia campaign rally, Monday, Nov. 5, 2012, at The Patriot Center, George Mason University in Fairfax, Va. (AP Photo/Charles Dharapak)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney smiles as he jokingly holds onto the bag of campaign strategist Stuart Stevens as they board their plane in Norfolk, Va.,Friday, Nov. 2, 2012, as he travels to campaign events in Milwaukee, Wis. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney boards his campaign plane in Tampa, Fla., Wednesday, Oct. 31, 2012, as he flies to campaign events in Miami, Fla. (AP Photo/Charles Dharapak)

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FILE - In this Oct. 17, 2012 file photo, Republican presidential candidate and former Massachusetts Gov. Mitt Romney campaigns at Ida Lee Park in Leesburg, Va. (AP Photo/Charles Dharapak)

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** FILE ** President Obama kisses German Chancellor Angela Merkel on the cheek on her arrival for the G-8 summit on Friday, May 18, 2012, at Camp David, Md. (AP Photo/Charles Dharapak)

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Secretary of State Hillary Rodham Clinton (AP Photo/Charles Dharapak)

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President Obama greets audience members after speaking about energy on Thursday, March 15, 2012, at Prince George's Community College in Largo, Md. (AP Photo/Charles Dharapak)

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Former Utah Gov. Jon Huntsman Jr., accompanied by his wife, Mary Kaye, announces he is ending his campaign for the Republican presidential nomination on Monday, Jan. 16, 2012, in Myrtle Beach, S.C. (AP Photo/Charles Dharapak)

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President Barack Obama speaks to the crowd as first lady Michelle Obama listens before the Carrier Classic NCAA college basketball game between Michigan State and North Carolina aboard the USS Carl Vinson, Friday, Nov. 11, 2011, in Coronado, Calif. (AP Photo/Charles Dharapak)

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President Obama addresses military personnel who have returned recently from Afghanistan on Friday, May 6, 2011, at Fort Campbell, Ky. (AP Photo/Charles Dharapak)

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President Obama addresses military personnel who recently returned from Afghanistan on Friday, May 6, 2011, at Fort Campbell, Ky. (AP Photo/Charles Dharapak)

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President Barack Obama talks with U.S. Navy Vice Admiral William H. McRaven, who as commander of Joint Special Operations Command (JSOC) had operational control of the mission to get Osama bin Laden, Friday, May 6, 2011, at Campbell Army Airfield in Fort Campbell, Ky. (AP Photo/Charles Dharapak)