In days gone by, parties were political organizations designed to win elections and gain power. Party leaders would expand their coalitions toward that end. Today, on the other hand, in an increasingly secular age, political parties are better seen as religious organizations that exist to provide believers with meaning, membership and moral sanctification. If that’s your purpose, of course you have to stick to the existing gospel. You have to focus your attention on affirming the creed of the current true believers. You get so buried within the walls of your own catechism, you can’t even imagine what it would be like to think outside it.

When parties were primarily political organizations, they were led by elected officials and party bosses. Now that parties are more like quasi-religions, power lies with priesthood — the dispersed array of media figures, podcast hosts and activists who run the conversation, define party orthodoxy and determine the boundaries of acceptable belief.