Mitt Romney

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Supporter Annie Lin, from Salem, Va., center, wearing plastic Romney lawn signs, cheers Republican presidential candidate, former Massachusetts Gov. Mitt Romney while he speaks at a campaign event at Integrity Windows in Roanoke, Va., Thursday, Nov. 1, 2012. (AP Photo/Charles Dharapak)

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The shadow of a child applauding is cast against a truck as Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at a campaign event at Integrity Windows in Roanoke, Va., Thursday, Nov. 1, 2012. (AP Photo/David Goldman)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney gestures while speaking at a campaign event at Integrity Windows in Roanoke, Va., Thursday, Nov. 1, 2012. (AP Photo/David Goldman)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney waves as he takes the stage for a campaign event at a window and door factory, Thursday, Nov. 1, 2012, in Roanoke, Va. (AP Photo/David Goldman)

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A silhouetted Republican presidential candidate, former Massachusetts Gov. Mitt Romney steps off his plane at Roanoke Regional Woodrum Field in Roanoke, Va., Thursday, Nov. 1, 2012, for campaign events. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters, including one wearing an elephant hat, left, as he campaigns at Integrity Windows in Roanoke, Va., Thursday, Nov. 1, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, accompanied by Virginia Republican Senate candidate George Allen, left, gestures while speaking at a campaign event at a window and door factory, Thursday, Nov. 1, 2012, in Roanoke, Va. (AP Photo/David Goldman)

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Supporters are seen in a truck mirror as Republican presidential candidate, former Massachusetts Gov. Mitt Romney is introduced by Virginia Republican Senate candidate George Allen as they campaigned at Integrity Windows in Roanoke, Va., Thursday, Nov. 1, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney poses for a photo with law enforcement members which escorted his motorcade before boarding his campaign plane in Jacksonville, Fla., Thursday, Nov. 1, 2012, enroute to campaign stops in Virginia. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney and Virginia Republican Senate candidate George Allen wave to supporters during a campaign at Integrity Windows in Roanoke, Va., Thursday, Nov. 1, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate Mitt Romney speaks at a campaign event at the University of Miami, Wednesday, Oct. 31, 2012, in Coral Gables, Fla. (Associated Press)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney gives a thumbs up as he arrives at a campaign stop in Tampa, Fla., Wednesday, Oct. 31, 2012. At rear on screen is a number for Red Cross donations for victims of superstorm Sandy. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters during a campaign stop in Tampa, Fla., Wednesday, Oct. 31, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney gestures while speaking at a campaign stop in Tampa, Fla., Wednesday, Oct. 31, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns in Tampa, Fla., Wednesday, Oct. 31, 2012. Behind him, from left are, former Florida Gov. Jeb Bush, Sen. Marco Rubio, R-Fla., and Florida Republican Senate candidate, Rep. Connie Mack, R-Fla. (AP Photo/Charles Dharapak)