WASHINGTON (AP) — A lot of Republicans would like Donald Trump to go away. But not too far. The prospect that Trump might eventually leave the primaries and run for president on his own has started to cast a shadow on the race, reviving memories of Ross Perot, Ralph Nader and the chills their third-party campaigns gave to Republicans and Democrats in turn. To Republican pollster Frank Luntz, a third-party Trump campaign would mean, quite simply, "President Hillary Clinton." Democratic strategist Maria Cardona, who is close to the Clinton campaign, agrees: "He's the greatest gift we have." Not all Republicans foresee the apocalypse if Trump goes rogue.