Here's a great point to raise with liberal friends about Social Security... ask them WHO is saying it's in crisis, that Something Must Be Done? Why, George Bush and his legions of orcs, that's who! Since when has that pack of thugs done anything but sack and burn every peasant village they can find?
Or, to put it another way... given a choice between protecting the greatest of the New Deal programs, and robbing you of your life savings, which do you think they'd choose? Now, they want to privatize Social Security. Um. Why?
I've found this argument works when dealing with the far worse problem i've seen... that most Generation X folk don't think they'll ever see a dime of Social Security, if they think about it at all. It has been conventional wisdom for ages that Social Security will collapse long before we retire. No one really knows why, that's just what they think. That's why Bush's plan has gotten the reception it has... the audience already believes the critical first part of it.
In the great framing war, more than anything else, i believe we are responsible for convincing our peers that Social Security is NOT in crisis, and that its biggest threats are external rather than internal. And, for receptive liberal ears, the best argument i've found is that Bush is the biggest proponent of "reform".