FILE - In this April 16, 2008 file-pool photo, Democratic presidential hopefuls, Sen. Hillary Clinton, D-N.Y. and Sen. Barack Obama, D-Ill., arrive for a Democratic presidential debate at the National Constitution Center in Philadelphia. Hillary Clinton has appeared in more than 30 primary debates during her two presidential campaigns, a deep history she can draw upon as she faces Donald Trump on Monday, Sept. 26, 2016. Clinton has been through the debate gauntlet in two New York Senate campaigns as well as in presidential primary match-ups against then-Sen. Barack Obama in 2008, Vermont Sen. Bernie Sanders this year and other challengers. (AP Photo/Jae C. Hong, Pool, File)

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