She'll rely on an outside group to pummel him, while keeping her distance. New research says it'll work. ...This year, in her coming face-off with Donald Trump, Hillary Clinton needs to do what George W. Bush did back then (with the swiftboaters): Find a way to take the opponent down, hard, but without voters connecting her to the attacks. Meanwhile, the candidate who benefited from the “swiftboating,” President George W. Bush, suffered no real blowback from ads that smeared a decorated war veteran on his behalf. Voters—other than angry Kerry supporters—didn’t hold Bush responsible for the sketchy commercial that did...