Vice President Joe Biden and Republican vice presidential nominee Paul Ryan of Wisconsin shake hands before the vice presidential debate at Centre College, Thursday, Oct. 11, 2012, in Danville, Ky. (AP Photo/Pool-Michael Reynolds)

Associated Press
Vice President Joe Biden and Republican vice presidential nominee Paul Ryan of Wisconsin shake hands before the vice presidential debate at Centre College, Thursday, Oct. 11, 2012, in Danville, Ky. (AP Photo/Pool-Michael Reynolds)
Vice President Joe Biden and Republican vice presidential nominee Paul Ryan of Wisconsin shake hands before the vice presidential debate at Centre College, Thursday, Oct. 11, 2012, in Danville, Ky. (AP Photo/Pool-Michael Reynolds)
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