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.
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.