Republican presidential nominee Mitt Romney meets audience members after he addressed the U.S. Hispanic Chamber of Commerce in Los Angeles on Monday. Charles Dharapak/AP hide caption

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President Barack Obama joins Former President Bill Clinton on stage during the Democratic National Convention in Charlotte, N.C., on Wednesday. J. Scott Applewhite/AP hide caption

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President Obama speaks during a campaign event at a high school in Toledo, Ohio. Pablo Martinez Monsivais/AP hide caption

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It may be in former President Bill Clinton's (and his wife's) interest to help keep the Democratic party together for the next convention. Carolyn Kaster/AP hide caption

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President Clinton signs the welfare reform law on Aug. 22, 1996. Stephen Jaffe /Reuters /Landov hide caption

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Republican presidential candidate Mitt Romney speaks at a town hall meeting in Grand Junction, Colo., on July 10. Romney said he has "nothing hidden" in his taxes. Nicholas Kamm/AFP/Getty Images hide caption

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CNN's Candy Crowley at a Mitt Romney campaign event during the Iowa caucuses in January. David Holloway/CNN hide caption

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Republican presidential candidate Mitt Romney meets Israeli Prime Minister Benjamin Netanyahu before a meeting at the prime minister's office Sunday in Jerusalem, Israel. Uriel Sinai/Getty Images hide caption

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President Obama greets students after speaking at the University of Michigan in Ann Arbor on Jan 27. Young Republicans say they see an opportunity in 2012 to dent Obama's popularity among the youngest voters. Jewel Samad/AFP/Getty Images hide caption

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