http://en.wikipedia.org/wiki/List_of_United_States_Presidential_assassination_attempts#Jimmy_Carter
May 5, 1979: Ten minutes before Carter was about to speak at the civic center mall in Los Angeles, Raymond Lee Harvey was arrested carrying a pistol.[23] He later told authorities that he and another man were hired to create a diversion so that Mexican hit men armed with sniper rifles could kill Carter. Charges against him were dismissed for lack of evidence.[24]