Republican Rep. Trey Gowdy sent waves through the GOP presidential race with word he will endorse Marco Rubio. The announcement — the Rubio campaign is touting Gowdy’s upcoming trip to Iowa on Rubio’s behalf — became the subject of angry tweets from Donald Trump supporters, who quickly denounced Gowdy as a RINO and a fake conservative. (Gowdy’s rating from the American Conservative Union is a near-perfect 97 for the nearly five years he has served in the House.)