I don't think that anyone has ever said that the City and County of Denver is conservative. It's really not. It's not Boston or Chicago or anything like that. Relatively speaking, it's pretty middle-of-the-road. My comments are more broadly speaking of the metropolitan area as a whole. The suburbs are remarkably conservative and since the suburbs are so much larger than the city of Denver, I consider the metro area to be pretty conservative.
Cities like Chicago and Philadelphia generally have very liberal core city areas and moderate and barely conservative suburbs. Denver has a moderate/liberal city core and very conservative suburbs. All that means is that if you live where most metro area residents live--outside of Denver--you're going to be living in a conservative area where religion is a huge deal and homosexuality isn't very accepted.
Denver and Boulder are blue blips on a bright red radar screen. A lot like Austin and the rest of Texas...