Likely in 2000 Bush got an artifically high result there because Cheney gave him a big boost. This year the Cheney effect had worn off.
Yeah, but 2000 was the first time that Teton was the Dems' best county in the state (see my thread, Best Dem and Rep results, by county
).
As for why I'm not quite sure, but obviously resort area
workers turned out heavily for Kerry. Since many of these people are pretty young and have relatively recently moved to wherever they are now, I'd figure it's got a lot to do with Dem registration drives since and low turnout among 18-30 year olds in 2000 - much like the equally pronounced Dem swing in college town-dominated counties.
Oh, à propos LDS: Alpine County CA which Kerry swung is 45% Mormon.