A combination file photographs shows U.S. President Barack Obama and Republican presidential nominee Mitt Romney speaking at campaign rallies

 
A combination file photographs shows U.S. President Barack Obama and Republican presidential nominee Mitt Romney speaking at campaign rallies
A combination file photographs shows U.S. President Barack Obama (L) speaking during a campaign rally in Mentor, Ohio on November 3, 2012 and Republican presidential nominee Mitt Romney speaking at a campaign rally in Tampa, Florida on October 31, 2012. REUTERS/Jason Reed, Brian Snyder/Files