I mean honestly, look at some polls. The only people who are against legalization are hardline social conservatives, who are becoming smaller as a portion of the voting population each year. And even the evangelical crowd is warming up to pot faster than, say, gay marriage.
And Montana isn't even in the Bible Belt.
I used to browse FreeRepublic.com back in the late 2000's, to see what the enemy was up to. It was a real nasty right wing extremist website filled with lots of racism towards Obama. Oddly enough though, even among those hard line Tea Party types they we're always cracking jokes about pot and a bunch admitted to smoking pot themselves back in the 60's and 70's and thought the government should stay the hell out of the issue.