Bret Stephens: Can anyone save the Republicans from Trumpism?

Bill Weld, the former Massachusetts governor and current long-shot — make that, loooooooong-shot — candidate for the Republican Party’s presidential nomination, is a keen student of New Hampshire politics. In an interview with me this week, he noted the following fact: Every time an incumbent president of either party faced a significant primary challenge in the Granite State, he failed in his bid for reelection.It happened to George H.W. Bush in 1992 after Patrick Buchanan too