Mitt Romney

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**FILE** Republican presidential candidate Mitt Romney hosts a small-business roundtable July 23, 2012, during a campaign stop at Endural LLC in Costa Mesa, Calif. (Associated Press)

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Republican presidential candidate Mitt Romney leaves Aug. 16, 2012, after a news conference at Spartanburg International Airport in Greer, S.C. (Associated Press)

Republican presidential candidate Mitt Romney writes on a white board Aug. 16, 2012, as he talks about Medicare during a news conference at Spartanburg International Airport in Greer, S.C. (Associated Press)

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**FILE ** The Ohio flag flies in the background as Republican presidential candidate Mitt Romney speaks during a campaign event at the Ross County Courthouse in Chillicothe, Ohio, on Tuesday, Aug. 14, 2012. (AP Photo/Mary Altaffer)

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Republican presidential candidate Mitt Romney waves Aug. 14, 2012, to the crowd during a rally at the Century Mine Main Office Building near Beallsville, Ohio. (Associated Press/The Intelligencer)

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A coal miner cheers as former Massachusetts Gov. Mitt Romney, the presumptive Republican presidential nominee, speaks during an event at the American Energy Corporation in Beallsville, Ohio, on Tuesday. The United Mine Workers of America has yet to make a decision about endorsing President Obama. (Associated Press)