What's the matter with conventional wisdom

Paul Krugman challenges, as he has before, the entire bitter/What's the Matter with Kansas thesis:

It’s true that Americans who attend church regularly are more likely to vote Republican. But contrary to the stereotype, this relationship is weak at low incomes but strong among high-income voters. That is, to the extent that religion helps the G.O.P., it’s not by convincing the working class to vote against its own interests, but by producing supermajorities among the evangelical affluent.

So why have Republicans won so many elections? In his book, “Unequal Democracy,” Mr. Bartels shows that “the shift of the Solid South from Democratic to Republican control in the wake of the civil rights movement” explains all — literally all — of the Republican success story. (link)