I'm a moderate through cynicism - my father's capitalist-conservative but many of my friends are socialist-liberal, and I've personally observed a near-identical ratio of rational, reasoned discourse to prejudiced kneejerking on both sides.
Admittedly, these friends of mine are student activists, which skews them towards the party-line-mouthing end of the spectrum. I personally lean very left-libertarian on most social issues - that is to say, I have very strong ideas about the role of government which includes welfare but excludes censorship, that sort of thing.
It basically boils down to my not having much patience for people who don't really consider their own "opinions" - and since I prefer to play with people I know and like, I don't tend to play with those people.