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President Obama and Mitt Romney shake hands at the start of the final presidential debate at Lynn University in Boca Raton, October 22, 2012. At center is moderator Bob Schieffer (Credit: Reuters/Kevin Lamarque)

President Obama and Mitt Romney shake hands at the start of the final presidential debate at Lynn University in Boca Raton, October 22, 2012. At center is moderator Bob Schieffer (Credit: Reuters/Kevin Lamarque)