Play of the Day -- A new campaign ad for Herman Cain

Conan O'Brien on Wednesday presented Herman Cain's new campaign ad in which he fights back against charges of infidelity. "Jimmy Carter never cheated on his wife and we had 7 percent unemployment," the narrator in the fake ad says. "Bill Clinton cheated on his wife every chance he could get and we had only 4 percent unemployment, 1 percent inflation and a balanced budget. Herman Cain: Because when presidents get laid, you get paid." Don't miss today's Must See Moment at 3:30 when Conan presents video of the former presidents who attended the Victoria Secret fashion show: