Paul Ryan

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Republican presidential candidate Mitt Romney, left, and his vice presidential running mate Rep. Paul Ryan, R-Wis., arrive at a campaign rally Sunday, August 12, 2012 in Mooresville, N.C. at the NASCAR Technical Institute. (AP Photo/Jason E. Miczek)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, center, and his wife Ann, arrive at the Oakland County International Airport with vice presidential running mate Rep. Paul Ryan, R-Wis., on Friday, Aug. 24, 2012 in Waterford, Mich. (AP Photo/Evan Vucci)

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Republican vice presidential candidate Paul Ryan speaks Aug. 21, 2012, during a campaign rally at Beaver Steel in Carnegie, Pa. (Associated Press)

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Mitt Romney and Paul Ryan visited New Hampshire on Monday to rebut President Obama’s claims Saturday that Mr. Romney would raise taxes on the middle class. (Associated Press)

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Former Massachusetts Gov. Mitt Romney, the presumptive Republican presidential nominee, and Rep. Paul Ryan of Wisconsin, his running mate, attend a town hall at St. Anselm College in Manchester, N.H., on Monday. The visit marked the first joint appearance for Mr. Romney and Mr. Ryan in New Hampshire. (Associated Press)

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Rep. Paul Ryan (right), the Republican presidential running mate, listens at right as GOP presidential candidate Mitt Romney makes a point during a town-hall-style campaign event at St. Anselm College in Manchester, N.H., on Monday, Aug. 20, 2012. (AP Photo/Cheryl Senter)

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Supporters file in to hear Republican presidential candidate Mitt Romney and his running mate, Rep. Paul Ryan, speak at a town-hall event on Monday, Aug. 20, 2012, at St. Anselm College in Manchester, N.H. (AP Photo/Cheryl Senter)

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Rep. Paul Ryan, the Republican vice presidential candidate, introduces his mother, Betty Ryan Douglas, to supporters Aug. 18, 2012, at a campaign rally in The Villages, Fla. (Associated Press)