The demographics as destiny crowd seems very gung ho on Montana (the Vermont of the Mountain West!)
I'm not sure for good reason however. In 2008 it was R+10 compared to the nation, in 2012 R+18, in 2016 R+22, in 2020 R+21. The population growth is in the liberal cities, but Democrats definitely have some room to fall in the more rural areas, where they overperform. MT will probably trend left long term, but by the time its competitive at the presidential level American politics will likely have realigned by then. Dems get closer in the Senate/Gov races, but MT is losing its penchant to vote for Democrats as polarization takes hold more. Tester might the last statewide Democrat elected for a long time.