Mitt Romney

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** FILE ** Republican presidential candidate Mitt Romney speaks on Sunday, June 17, 2012, at a campaign event at K's Hamburger Shop in Troy, Ohio. Joining him onstage is Sen. Rob Portman (left), Ohio Republican, and House Speaker John A. Boehner, Ohio Republican. (Associated Press)

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Republican presidential hopeful Mitt Romney arrives for a campaign stop at Mapleside Farms on Sunday in Brunswick, Ohio. No Republican ever has won the White House without winning the Buckeye State. (Associated Press)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney applauds during a campaign stop at Cornwall Iron Furnace on Saturday, June 16, 2012, in Cornwall, Pa. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney waves to the crowd during a campaign stop in Cornwall, Pa., on Saturday, June 16, 2012. (AP Photo/Lebanon Daily News, Earl Brightbill)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney gestures during a campaign stop at Weatherly Casting Company in Weatherly, Pa., Saturday, June 16, 2012. (AP Photo/Evan Vucci)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney and his wife, Ann, arrive June 15, 2012, for a campaign stop at the Scamman Farm in Stratham, N.H. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks June 14, 2012, during a campaign event at Seilkop Industries in Cincinnati, Ohio. (Associated Press)

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Former Massachusetts Gov. Mitt Romney, the presumptive Republican presidential nominee, delivers a stump speech during a campaign stop at Seilkop Industries in Cincinnati on Thursday. Mr. Romney slammed the president's record on handling the economy, accusing the president of being "long on words and short on action." (Associated Press)