Mitt Romney

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Republican presidential candidate Mitt Romney campaigns Aug. 8, 2012, at Central Campus High School in Des Moines, Iowa. (Associated Press)

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Republican presidential candidate Mitt Romney thanks Warren Young, chief executive officer at Acme Industries, as he campaigns in Elk Grove Village, Ill., on Aug. 7, 2012. (Associated Press)

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Republican presidential candidate Mitt Romney puts corn in a plastic bag Aug. 6, 2012, as he shops for groceries at Hunter’s Shop and Save supermarket in Wolfeboro, N.H. (Associated Press)

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Mitt Romney combines campaigning with a grocery store run in Wolfeboro, N.H., on Monday. According to polls, voters say Mr. Romney is better equipped to handle the economy, but they’d rather have a beer with President Obama. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney campaigns at Stepto's BBQ Shack in Evansville, Ind., Saturday, Aug. 4, 2012. (AP Photo/Charles Dharapak)

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** FILE ** Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns at the Jefferson County Fairgrounds in Golden, Colo., Thursday, Aug. 2, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns at the Jefferson County Fairgrounds in Golden, Colo., Thursday, Aug. 2, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate Mitt Romney holds up a "presidential accountability scorecard" comparing himself to President Obama, as he campaigns Aug. 2, 2012, at the Jefferson County Fairgrounds in Golden, Colo. (Associated Press)