egy
I think this is a critical point. I would also expect many MBAs to see economic and social issues separately, with most economically conservative (less government intervention, free trade, free market, etc.) with probably a toss up on the social side.
I can say that at Fuqua, while there are a number of identifiable conservatives, an overwhelming majority of folks here would identify as moderates (ex. voted for Obama). I suspect it's substantially similar at any other good school, for this reason: on average, well-educated people tend to be significantly more liberal. It's certainly not always the case, but the trend is undeniable.
Regarding the whole economic/social bent, I think that it's more a matter of pragmatism. No, there aren't a lot of communists, socialists or autarkists at Western business schools, just like there aren't many creationists in molecular biology programs - there's a self-selection bias there. People in B-school are interested in what makes sense practically. That means they like rational economic policies, just like any other reasonable person, and have a strong aversion to the religious crazies who control one party in our country...