One former president, one would-be: Republican presidential nominee Mitt Romney (left), spoke this morning at former President Bill Clinton's annual forum in New York City. President Obama addresses the Clinton Global Initiative later today. Mandel Ngan /AFP/Getty Images hide caption

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Republican presidential candidate Mitt Romney talking to reporters Monday in Costa Mesa, Calif. Nicholas Kamm /AFP/Getty Images hide caption

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Vice President Biden and President Obama wave to the delegates Thursday night at the conclusion of the Democratic National Convention in Charlotte, N.C. Robyn Beck /AFP/Getty Images hide caption

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August 2011: President Obama (right) and House Speaker John Boehner at the White House as they and other lawmakers worked to head off a government shutdown that loomed. Jewel Samad /AFP/Getty Images hide caption

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Former President Bill Clinton at the Democratic National Convention in Charlotte, N.C., Wednesday night. Mladen Antonov /AFP/Getty Images hide caption

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The scene Tuesday night at the Democratic National Convention in Charlotte, N.C. Mladen Antonov /AFP/Getty Images hide caption

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One of the many mementos for sale at the Democratic National Convention in Charlotte, N.C. Win McNamee/Getty Images hide caption

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Republican presidential nominee Mitt Romney on Thursday at the Republican National Convention in Tampa. Spencer Platt/Getty Images hide caption

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Delegates filled the floor Tuesday during the Republican National Convention at the Tampa Bay Times Forum in Tampa, Fla. Win McNamee/Getty Images hide caption

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