I feel like people are seriously overestimating how Republican Montana is.
No. I know quite well, that Montana elects Democratic governor and one Democratic Senator, and so on. But it's not an Montana of mid-late-70th, when i began to study American politics. THAT Montana elected predominantely
Democrats, present day - not
That's definitely true and the state isn't solidly Democratic anymore, but it's also not solidly Republican and still perfectly fine with electing a Democrat. Republicans did well in 2014 and 2016, but those were GOP wave years (and Clinton was a comically bad fit for the state). Honestly, it's quite similar to pre-2014's Maine in the sense that it's a state that is much less solid for one party than might appear at first glance. It's like a mix of North Dakota, Vermont, Colorado and Wyoming.
I think 2018 and 2020 will be quite telling. If Tester goes down and Daines gets reelected, it will be the first time since 1911 that he state has 2 Republican Senators. If they can then win the gubernatorial race in 2020 in addition that, it'll be safe to call MT a Republican state. But before that? No.