Costner mostly lives in Summerland,CA. Every once in a while I see him at the harbor having a beer on one of the fishing boats "being one of the guys".
Unfortunately even though many of these people don't live full time in places like Montana and Wyoming, they can still screw things up by being a riffraff magnet. Just look at Sun Valley,ID. John Kerry has a house there that is a chateau Theresa supposedly had delivered over from Europe. You know that neither of them spend much time there, but name recognition draws plenty of liberals. If you look at a political map of Idaho, Sun Valley and Moscow (university) are about the only blue regions in the state.