SWING TO THE RIGHT: John Rosenberg has a post that tries to explain the phenomenon Brad De Long writes about. And Nick Confessore emailed to say that I don’t appreciate the tremendous, er, “discipline” of Republicans in DC and the groupthink that goes with it.

No, I don’t. That’s probably because (1) I’m not a Republican; and (2) I don’t live in DC. But even when I did live in DC in the 1980s, I found Republicans more anxious to win converts, and Democrats more anxious to condemn political incorrectness. Perhaps that was just the crowd I ran with — not everyone can be as openminded and welcoming as, say, Nick’s old boss Bob Kuttner — but perhaps not.

UPDATE: Reader Peter Weinstein says that it’s all explained by this Mark Steyn column.