Not long ago, the notion that American politics was oriented around a dispute over the merits of child sexual exploitation was viewed as so loopy that not even Donald Trump could take it seriously. It is now becoming the Republican Party’s most energetic idea. The two most prominent theaters of partisan combat of the moment, the Ketanji Brown Jackson confirmation and Florida’s “Don’t Say Gay” law, have both seen a growing swath of conservatives embrace charges of pedophilia as their central theme.

Two years ago, the pedophilia charge was confined almost entirely to QAnon, a sprawling web of far-right conspiracy theories that operated around the fringes of conservative politics. And while some of the details produced by its theories would find their way into the minds of Trump and his inner circle (especially with conspiracy theories centering on the “stolen election”), the broader narrative that American politics was a fight over pedophilia remained marginal.

The pretext for injecting the theme into the Jackson hearings was that, as a judge, she supposedly […]