In addition to immigration hardliners, there are several other Republican constituencies that find things to like about this year's version of Mr. Trump. (In past years, Mr. Trump was calling himself pro-choice and spoke positively about a national health care system; two stances he now rejects.) Birthers, of course, love him because, during the 2012 election, he joined their paranoid tribe by expressing serious doubts about President Obama's true birthplace. Many Tea Party partisans admire Mr. Trump, not only because they are in harmony with him on many issues, but because his angry, "the-country-is-going-to-Hell" diatribes match their own ill-temper. And then there are all those Republican millionaires and billionaires who may like Mr. Trump simply because he is one of them and is not embarrassed to brag about it.