Krugman on Partisanship

Over at the Times, Paul Krugman's got a good piece on partisanship (subscription required). The gist of the argument is that in our era of exceptionally divisive politics, party affiliation simply matters more than individual principles when it comes to making decisions about whom to support. And, what's more pressing, the Democrats, as well as liberal interest groups, don't seem to be getting the message. Too bad.