Mitt Romney

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Republican presidential candidate Mitt Romney speaks Sept. 19, 2012, to supporters in Miami. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney campaigns at a rally at Darwin Fuchs Pavilion in Miami, Wednesday, Sept. 19, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney waves to supporters before he makes a speech in Miami, Wednesday, Sept. 19, 2012. (AP Photo/J Pat Carter)

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Republican presidential candidate Mitt Romney answers questions at a Univision “Meet the Candidates” forum posed by Jorge Ramos and Maria Elena Salinas. (Associated Press)

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Republican presidential candidate Mitt Romney speaks Sept. 17, 2012, to reporters in Costa Mesa, Calif. (Associated Press)

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Republican presidential candidate Mitt Romney speaks at a campaign fundraiser in Salt Lake City on Tuesday, Sept. 18, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate Mitt Romney gets into his vehicle after his arrival at Love Field in Dallas on Tuesday, Sept. 18, 2012. (AP Photo/Charles Dharapak)

Lunch is served as Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks at a campaign fundraising event at The Grand America in Salt Lake City, Utah, Tuesday, Sept. 18, 2012. (AP Photo/Charles Dharapak)

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Lunch is served as Republican presidential candidate Mitt Romney speaks Sept. 18, 2012, at a campaign fundraising event — the first in which reporters' cameras were allowed — at the Grand America in Salt Lake City. (Associated Press)