Which Party Has Gotten More Extreme Faster?

Source: Astral Codex Ten
by Scott Alexander

“Matt Yglesias has written a couple of posts (1, 2) on the subject of this meme (originally by Colin Wright, recently signal-boosted by Elon Musk) … He concludes that, contra the image where the Right stays in the same place and the Left [sic] moves, both Republicans and Democrats have ‘changed a lot’ since 2008. He wisely avoids speculating on whether one party has moved further or faster than the other. I’m less wise, so I’ve been trying to look into this question. My conclusion is: man, people really have strong emotions on this.” (06/07/22)