Comedian Kathy Griffin’s anti-Trump beheading “art” has worked its way into Georgia’s June 20 special election.A battle between Republican Karen Handel and Democrat Jon Ossoff for Georgia’s 6th Congressional District heated up this week with an Islamic State-like execution photo shoot by Ms. Griffin. A Republican super PAC, Congressional Leadership Fund, released an ad Thursday tying Mr. Ossoff to his “celebrity supporter.”“These angry liberals will go to any extreme to elect Jon Ossoff,” a narrator in the ad says. “There’s a reason 95 percent of Ossoff’s campaign donors are out-of-state liberals.” The Ossoff campaign issued a statement demanding the ad,...