The Great Recession should have been a huge wake-up call. Nothing like this was supposed to be possible in the modern world. Everyone, and I mean everyone, should be engaged in serious soul-searching, asking how much of what he or she thought was true actually isn’t.

But the G.O.P. has responded to the crisis not by rethinking its dogma but by adopting an even cruder version of that dogma, becoming a caricature of itself. During the debate, the hosts played a clip of Ronald Reagan calling for increased revenue; today, no politician hoping to get anywhere in Reagan’s party would dare say such a thing.

It’s a terrible thing when an individual loses his or her grip on reality. But it’s much worse when the same thing happens to a whole political party, one that already has the power to block anything the president proposes — and which may soon control the whole government.