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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It's true that Mitt Romney trails President Obama in most key battleground states, but the margins are in single digits Mark Lennihan/AP hide caption

itoggle caption Mark Lennihan/AP

Republican presidential candidate Mitt Romney speaks at a campaign event at the Cox Pavilion Friday in Las Vegas. David Becker/Getty Images hide caption

itoggle caption David Becker/Getty Images