Driving I-70 to GJ or Moab and back from the Front Range, most left lane squatters have California plates, and they won't move no matter what. I don't bother trying to change their ways. The State Patrol could have a field day on them.
Then again, I tend to drive the left lane on open highways because of the right lane truck damage, but I always move right for faster traffic. So far, I haven't had to explain to a statie.