This is pretty smart:

President Barack Obama's campaign is offering Mitt Romney a deal: if he releases five years of tax returns, Obama's team won't criticize him for not releasing any more.

Obama campaign manager Jim Messina made the offer to Romney campaign manager Matt Rhoades in a letter Friday. Messina says he is taking the step because Romney "apparently fears the more he offers, the more our campaign will demand that he provide."

This is really good strategy. It makes Romney's "they'll-never-be-satisfied" argument look hysterical, and it makes the Obama campaign look even more reasonable now. I do have to wonder where five years came from, though. Do they have inside information on Romney's taxes? Was the number picked because it seemed the most reasonable? Or did they not care about the number because they know Romney will never release any of them?