However, it's even younger than being in it's infancy. Of all of those central and southern CA counties, none of the local govt's have official support on record and many would be a major uphill battle due to the demographic changes of just the last decade or so.
The only one that has not just support from the residents, but also has local political support in the counties is the State of Jefferson.
The New California state idea looks fantastic though. Seems there is a growing movement in CA to break the state up.