South Carolinians ought to see through Donald Trump’s pose as a winner to recognize him as a repeated failure, and should ignore his pretense as a populist to see his long record of leaving ordinary Americans in the lurch. Trump won’t fight for American voters; he fights only for himself, and he loses more than he wins. Trump, who inherited hundreds of millions of dollars from his father, failed with Trump Steaks, failed with Trump Vodka, failed with the United States Football League, failed with Trump Air, failed with Trump Mortgage company, failed with his major companies’ four infamous bankruptcies,...