Mitt Romney

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Republican presidential candidate Mitt Romney takes pictures with California Highway Patrol officers before he boards his campaign plane in Los Angeles on Sept. 23, 2012. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney boards his campaign plane in San Francisco, Saturday, Sept. 22, 2012. (AP Photo/Charles Dharapak)

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This photo released by Romney for President Press Secretary Andrea Saul via Twitter, firemen enter the plane carrying Anne Romney, wife of Republican Presidential nominee Mitt Romney, after the plane made an emergency landing Friday, Sept. 21, 2012 in Denver. (AP Photo/Romney for President)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks at a campaign fundraising event at Red Rock Hotel and Casino in Las Vegas, Friday, Sept. 21, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate Mitt Romney gets in his vehicle as he arrives in Las Vegas on Sept. 21, 2012. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney arrives in West Palm Beach, Fla., for private campaign fundraising events, Thursday, Sept. 20, 2012. (AP Photo/Charles Dharapak)

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GOP presidential nominee Mitt Romney speaks Thursday in Sarasota, Fla. Florida is a key swing state for Mr. Romney’s campaign. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney campaigns at the Ringling Museum of Art in Sarasota, Fla., Thursday, Sept. 20, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate and former Massachusetts governor Mitt Romney gestures during a campaign rally at the Ringling Museum of Art Thursday, Sept. 20, 2012, in Sarasota, Fla. (AP Photo/Chris O'Meara)