Republican presidential candidate Mitt Romney speaks during a campaign rally at Union Terminal on September 1, 2012 (Photo by Justin Sullivan/Getty Images)

CINCINNATI, OH - SEPTEMBER 01: Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters during a campaign rally at Union Terminal (Photo by Justin Sullivan/Getty Images)

Republican presidential candidate Mitt Romney and his wife Ann Romney arrive at a campaign rally at Union Terminal on September 1, 2012 in Cincinnati, Ohio. (Photo by Justin Sullivan/Getty Images)

Supporters of Republican presidential candidate Mitt Romney look on before the start of a campaign rally at Union Terminal on September 1, 2012 in Cincinnati, Ohio. (Photo by Justin Sullivan/Getty Images)

Republican presidential candidate Mitt Romney greets supporters during a campaign rally at Union Terminal on September 1, 2012. (Photo by Justin Sullivan/Getty Images)

Republican presidential candidate Mitt Romney speaks during a campaign rally at Union Terminal (Photo by Justin Sullivan/Getty Images)

Republican presidential candidate Mitt Romney (R) and his wife Ann Romney (L) look on as Speaker of the House John Boehner speaks to an overflow crowd during a rally at Union Terminal (Photo by Justin Sullivan/Getty Images)

Mitt Romney talks on the stage at the Cincinnati Museum Center Sept. 1, 2012.

Mitt Romney and other local politicians prepare to take the stage at the Cincinnati Museum Center Sept. 1, 2012.

Mitt Romney supports wait for the speeches to begin at Cincinnati Museum Center Sept. 1, 2012.

A view of homemade Welsh Cakes that were handed out by Ann Romney to members of the traveling press aboard the campaign plane on September 1, 2012 in Cincinnati, Ohio. (Photo by Justin Sullivan/Getty Images)

The rotunda at Cincinnati Museum Center is crowded with Mitt Romney supporters on Sept. 1, 2012.

Mitt Romney takes the stage at the Cincinnati Museum Center on Sept. 1, 2012.

Mitt Romney supporters wait to hear local politicians speak at Cincinnati Museum Center on Saturday, Sept. 1, 2012.

People with signs before Mitt Romney speaks at Cincinnati Museum Center on Saturday, Sept. 1, 2012.

A woman displays her sign about Medicaid before Mitt Romney takes the stage at Cincinnati Museum Center Saturday, Sept. 1, 2012.

Mitt Romney supporters at Cincinnati Museum Center.

Hundreds of people gather in the rotunda of Cincinnati Museum Center waiting to hear GOP presidential candidate Mitt Romney speak.

Mitt Romney supporters wait to hear local politicians speak before the presidential candidate takes the stage on Saturday, Sept. 1, 2012.