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Air Force One is parked at John F. Kennedy International Airport before President Obama's July 30 departure from New York City, where he was attending a private fundraiser. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP

Mitt Romney speaks during a campaign stop at the Jefferson County Fairgrounds this month in Golden, Colo. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images