The five living presidents haven ' t always been as cordial as they were last week. Some historic zingers:
George H.W. Bush on Jimmy Carter, October 1980: "The American people will not abide a small, mean-minded, do-anything-to-win campaigner in the White House."
Barack Obama on Bill Clinton, January 2008: "We're going to have to … directly confront [him] when he's making statements that are not factually accurate."
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