Indeed, as seen in the 2016 campaign, it's his go-to move. Mr. Trump, the favored candidate of David Duke, challenged Hillary Clinton to address her "racist" 2008 campaign. Mr. Trump, king of the ad hominem insult, complained of opponents being "nasty" and "angry" toward him. Mr. Trump, who bragged about being a grabber of pudenda, condemned Bill Clinton's abuse of women. And so on.