Mitt Romney

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, followed by, from second from left, Florida Senate candidate, Rep. Connie Mack, R-Fla., Sen. Marco Rubio, R-Fla., and former Florida Gov. Jeb Bush arrive in Miami for a Romney campaign event, Wednesday, Oct. 31, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney talks with former Florida Gov. Jeb Bush as they fly on his campaign plane to Miami Fla., Wednesday, Oct. 31, 2012. (AP Photo/Charles Dharapak)

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Wearing a mask on Halloween, Carol Heye of Riverview, Fla., shows her support for Republican presidential candidate, former Massachusetts Gov. Mitt Romney as he campaigns in Tampa, Fla., Wednesday, Oct. 31, 2012. (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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Somchintana Hart of Tampa, Fla., center, and others, cheer as Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns in Tampa, Fla., Wednesday, Oct. 31, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters as he campaigns in Tampa, Fla., Wednesday, Oct. 31, 2012. (AP Photo/Charles Dharapak)

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

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

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A sign telling supporters how to donate to the Red Cross for superstorm Sandy victims is seen at left as Republican presidential candidate Mitt Romney campaigns in Tampa, Fla., on Wednesday, Oct. 31, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets people as he participates in a campaign event collecting supplies from residents and local relief organizations for victims of superstorm Sandy, Tuesday, Oct. 30, 0212, at the James S. Trent Arena in Kettering, Ohio. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney receives bags of food as he participates in a campaign event collecting supplies from residents local relief organizations for victims of superstorm Sandy, Tuesday, Oct. 30, 2012, at the James S. Trent Arena in Kettering, Ohio. (AP Photo/Charles Dharapak)

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U.S. Secret Service agents watch as Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks in a drizzle to board his campaign plane in Vandalia, Ohio, Tuesday, Oct. 30, 2012, as he travels to Tampa, Fla. for a campaign stop. (AP Photo/Charles Dharapak)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney steps off his campaign plane in Tampa, Fla., Tuesday, Oct. 30, 2012. (AP Photo/Charles Dharapak)

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Republican presidential nominee Mitt Romney loads a truck with supplies Tuesday in Kettering, Ohio, during a rally to raise donations for those affected by Hurricane Sandy. Mr. Romney encouraged unity during the event while avoiding attacks on President Obama. (Associated Press)