President Barack Obama listens as Republican presidential nominee Mitt Romney speaks during the second presidential debate at Hofstra University, Tuesday, Oct. 16, 2012, in Hempstead, N.Y. (AP Photo/Eric Gay)
** FILE ** Republican presidential nominee Mitt Romney and President Obama speak during the first presidential debate, at the University of Denver on Wednesday, Oct. 3, 2012, in Denver. (AP Photo/David Goldman/Eric Gay)
President Barack Obama listens as Republican presidential nominee Mitt Romney speaks during the second presidential debate. (AP Photo/Eric Gay)
** FILE ** Republican presidential nominee Mitt Romney and President Obama speak during the first presidential debate at the University of Denver on Wednesday, Oct. 3, 2012, in Denver. (AP Photo/David Goldman/Eric Gay)
Vice President Joe Biden listens to Republican vice presidential nominee Rep. Paul Ryan, of Wisconsin, during the vice presidential debate at Centre College, Thursday, Oct. 11, 2012, in Danville, Ky. (AP Photo/Eric Gay)
Vice President Joe Biden listens to Republican vice presidential nominee Rep. Paul Ryan, of Wisconsin, during the vice presidential debate at Centre College, Thursday, Oct. 11, 2012, in Danville, Ky. (AP Photo/Eric Gay)
Vice President Joe Biden listens to Republican vice presidential nominee Rep. Paul Ryan, of Wisconsin, during the vice presidential debate at Centre College, Thursday, Oct. 11, 2012, in Danville, Ky. (AP Photo/Eric Gay)
A sign promoting the Vice Presidential debate is held up at a rally on the Centre College campus, site of the debate, Thursday, Oct. 11, 2012, in Danville, Ky. (AP Photo/Eric Gay)
Vice President Joe Biden, left, and Republican vice presidential nominee, Rep. Paul Ryan, of Wisconsin, challenge each other during the vice presidential debate Thursday, Oct. 11, 2012, at Centre College in Danville, Ky. (AP Photo/Eric Gay)
