Are you sure you spotted a bumper sticker in CA? I haven’t seen ONE, not a ONE! I live in the Sacramento area and that’s not even mega-lefty country either, although it’s getting worse and worse.
I’d put one on my car, but I value my windows, tires, paint, and prefer not to get forced off the road by some frickin’ moonbat!
That’s probably why I don’t see one on anyone else’s car either.