The Washington Post's Ruth Marcus gets all bloggy in her column today, quoting the Times' Paul Krugman disparaging those who argue that Social Security faces a serious financing problem, then lining up passages written by Mr. Krugman earlier this decade in which he seems to agree that it does.

The attack comes on the heels of Mr. Krugman's spat with fellow Times columnist David Brooks over Reagan and race, in which, in apparent observance of an unspoken Times rule, each delicately avoided naming the other. So it'll be interesting to see whether Mr. Krugman responds to Ms. Marcus, and, if so, whether the rule seems to work any differently when the other columnist writes for a different paper.