This combination of file pictures shows U.S. President Barack Obama (L) waving as he steps off Air Force One upon arrival at King County International Airport in Seattle on September 25, 2011, and U.S. Republican presidential candidate Mitt Romney (R) boarding his campaign plane after a campaign rally September 24, 2012 at Pueblo Memorial Airport in Pueblo, Colorado September 24, 2012. (Mandel Ngan/AFP/Getty Images)
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