It's super cool how many California folks move to Montana and Idaho...
I can only speak of my area of Montana, but a lot of the Californians coming here are the political refugee types...including me. A guy running for the legislature in a district over from me moved here from southern Cal a few years ago. He owns a construction company, is a conservative Christian and has a very traditional view of family (he and his wife are on their fourth kid and he's not even forty). He didn't want anything of the new California for his family and future and relocated everything here and is now running for office.
Yeah, there are also left wing lunatics coming here, and the change happening is hard to whitewash with an "everything will be fine" bromide, but there's a lot more to the story than just "California invades".