CARLISLE, IA - DECEMBER 30:  Former U.S. President Bill Clinton speaks as he stumps for his wife Democratic Presidential hopeful U.S. Sen. Hillary Clinton (D-NY) at the Carlisle Middle School gymnasium December 30, 2007 in Carlisle, Iowa. With less than a week to go before the Iowa caucus, Bill Clinton is campaigning across Iowa for his wife Hillary. Getty Images logo Getty Images 23 months ago

CARLISLE, IA - DECEMBER 30: Former U.S. President Bill Clinton speaks as he stumps for his wife Democratic Presidential hopeful U.S. Sen. Hillary Clinton (D-NY) at the Carlisle Middle School gymnasium December 30, 2007 in Carlisle, Iowa. With less than a week to go before the Iowa caucus, Bill Clinton is campaigning across Iowa for his wife Hillary.