I'm posting my response to Ben's post here, because the interface is so much nicer that the little comment box...I wonder if that can be changed somewhere..
Anyway, I guess my first response to Ben's post is that the problem only arises if you accept the liberalist position that everyone does (or should) start from an equal position. Rawls does this in his theory of Justice and its exactly what bothers me about it: the assumption that to get an ideal system of justice everyone has to start at the same point. Not only does this render his theory practically usless (until he bends it to fit the real world later in Law of Peoples), the same problem lies at the base of all those philosophers' theories. If you start from an obviously idealized position its pretty hard to get back to reality.
Having said that, I don't think that a concept of political liberalism hinges on that concept. I would emphasize it as the
goal of liberalism to acheive parity of opprotunity for everyone, and the acceptance of a paternalist state that limits our freedoms to try and acheive that goal. I think you can still retain a good chunk of liberalist theory if we could just accept that they start in the wrong place, but end up with the "right" (in my liberal relativist nihilist opinion) kinds of ideas about how government should work in relation to people and personal liberties.