But I’d like to offer two alternative hypotheses: First, Republican extremism was there all along — what’s changed is the willingness of the news media to acknowledge it. Second, to the extent that the power of the party’s extremists really is on the rise, it’s the economy, stupid…

So why has the reporting shifted? Maybe it was just deference to power: as long as America was widely perceived as being on the way to a permanent Republican majority, few were willing to call right-wing extremism by its proper name. Maybe it took a Democrat in the White House to give some observers the courage to say the obvious…

When the economy plunged into crisis, many observers — myself included — expected a political shift to the left. After all, the crisis made nonsense of the right’s markets-know-best, regulation-is-always-bad dogma. In retrospect, however, this was naïve: voters tend to react with their guts, not in response to analytical arguments — and in bad times, the gut reaction of many voters is to move right.