metafilter used to have left slant but a degree of diversity. i specifically recall ironhands(? or similar) as a respected conservative commenter. those days are long, long gone. having the wrong opinion gets you run out.
IronMouth I think? I don't mod there anymore and haven't in a while but I still see some of the respected conservative commenters there but fewer than in the past.
IIRC, wasn't he a Democrat and a labor lawyer? More of a centrist Democrat than a conservative?
Can't recall, but maybe? We have people all over the map in terms of conservatism in a fiscal sense (some but not many Libertarians, in the US sense) but socially it's a pretty liberal place, so it depends what the overlap is between those things for a lot of people.