Tucker Carlson: Does Mike Cernavitch have the potential to prevent Trump from winning a nomination? He points out that eight GOP primaries were DNC-backed Trump candidates. The Democrats did the dirty trick of backing a Republican because they thought it would be the worst one, he says. And sure enough, that strategy worked; Trump was two for 16 in toss-up races. Tapper: Who else could stop him? It's me. There's nobody's close. I wouldn't lie about it.