Mitt Romney

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Republican presidential candidate Mitt Romney speaks in Houston on Wednesday, July 11, 2012. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney speaks in Houston on Wednesday, July 11, 2012. (AP Photo/Pat Sullivan)

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Republican presidential candidate Mitt Romney speaks to the annual meeting of the National Association for the Advancement of Colored People in Houston on Wednesday, July 11, 2012. (AP Photo/Evan Vucci)

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**FILE** Republican presidential candidate Mitt Romney is seen here on July 10, 2012, in Colorado Springs, Colo. (Associated Press)

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**FILE** Republican presidential candidate Mitt Romney (right) shares a laugh April 1, 2012, with Rep. Paul Ryan (center), Wisconsin Republican, and Sen. Ron Johnson, Wisconsin Republican, during a campaign event in Milwaukee. (Associated Press)

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Republican presidential candidate Mitt Romney pauses July 11, 2012, during a speech to the NAACP annual convention in Houston. (Associated Press/Houston Chronicle)

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Republican presidential candidate Mitt Romney speaks to the annual convention of the National Association for the Advancement of Colored People on Wednesday, July 11, 2012, in Houston. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney speaks July 10, 2012, to volunteers working at the Care and Share Food Bank of Southern Colorado in Colorado Springs, Colo., to distribute food to those affected by recent wildfires. (Associated Press)