Great blog post by Krugman, pointing out the destructive effect of the Villager cliché of "both sides do it."
Here's the concluding remark: "Pundits who won’t call out extremism without pretending that it’s symmetric aren’t a big part of our problem, but they are a part of our problem."
UPDATE: Today he has a full column up on the same subject, basically accusing the "cult of balance" of actively contributing to the destruction of the country.