Mitt Romney

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Republican presidential candidate Mitt Romney receives a commemorative coin from Maj. Gen. Francis D. Vavala after he addressed the National Guard Association Convention in Reno, Nev., on Sept. 11, 2012. (Associated Press)

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GOP presidential candidate Mitt Romney campaigns on Monday in Mansfield, Ohio. (Associated Press)

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GOP presidential hopeful Mitt Romney stands atop a makeshift stage Monday as he addresses an overflow crowd at PR Machine Works in Mansfield, Ohio. (Associated Press)

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Republican presidential candidate Mitt Romney campaigns at PR Machine Works in Mansfield, Ohio, Monday, Sept. 10, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate Mitt Romney campaigns Sept. 10, 2012, at PR Machine Works in Mansfield, Ohio. (Associated Press)

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Republican presidential candidate Mitt Romney (center) greets a supporter as he arrives at the Richmond International Raceway on Saturday, Sept. 8, 2012, in Richmond. (AP Photo/Richmond Times-Dispatch, Dean Hoffmeyer)

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Republican presidential nominee, former Massachusetts Gov. Mitt Romney addresses the audience at a rally with the GOP team at the Military Aviation Museum in Virginia Beach, Va., Saturday, Sept. 8, 2012. (AP Photo/Rich-Joseph Facun)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, campaigns at the Military Aviation Museum in Virginia Beach, Va., Saturday, Sept. 8, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks during a campaign stop in Orange City, Iowa, Friday, Sept. 7, 2012. (AP Photo/Nati Harnik)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney boards his campaign plane for an event in Iowa on Friday, Sept. 7, 2012, in Portsmouth, N.H. (AP Photo/Evan Vucci)

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** FILE ** In this Aug. 30, 2012, file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at the Republican National Convention in Tampa, Fla. (AP Photo/Jae C. Hong, File)