There’s this Luke Combs lyric that popped to mind on Tuesday as I watched ex-future House Speaker Kevin McCarthy’s dream die: “I ain’t gotta see my ex-future mother-in-law anymore,” says one of country music’s only celebratory breakup songs. “Oh, Lord, when it rains it pours.” McCarthy, poor lamb, was the last to know that the office he’d already moved into was not yet his. Even if the Bakersfield Republican does somehow grab the gavel now, he’s so weak that it won’t be for long. And it’s not at all surprising that Donald Trump sees McCarthy in mortal political peril and for an entire day asks...