Bush won Idaho and Wyoming 67-27, but Montana was "only" 58-33, so it seems a little different than other similar states. But it isn't that good an example, I agree, there is probably a better one somewhere.
Yeah Montana is a little less conservative than Idaho-Wyoming-Utah.
That could be because more of it's population is consentrated closer to Canada. Just a thought.
It could also be because of the very high Native American population. Three of the five counties Gore carried there are Native American areas. The others are actually in the decaying, ex-mining Butte area, not the Missoula area as claimed elsewhere.
Oh, and rich liberal areas being the most Dem places is true in Idaho (that county Gore carries there is Sun Valley) and Wyoming, but not as far as I can see in Montana.