Easily Idaho. The libs have the university towns in MT as well as the area around Flathead Lake. I live in Eastern WA, almost in ID and not far from Canada. This part of the state is cheap to live and conservative. If it weren’t for no WA state income tax I’d be going to ID quickly. Coeur d alene area very nice but more expensive real estate than NE WA. Be advised, ID has a real estate tax on “view”.
My real estate taxes in ID are 20% of what they were in Illinois.