Greg's right that it's gonna be really hard for Obama to bring around the Democrat rank and file to make SS cuts, especially, as with chained CPI, to current recipients. And Atrios is right that it's gonna be even harder to bring around Republican rank and file in support of either end of the "bargain." Neither their old people base nor Norquist is God base support this "bargain."
Has Peterson put something in the water?
I guess the simpler explanation is the Dem leadership really does want to cut "entitlements" because.... well, really I don't know. Bad policy, bad politics that inflict real pain. I know Dancin' Dave and his friends think pain is good for its own sake, but the Dem leadership?