Trump can build the wall around Cali to keep them in and not bother the rest of us."
I'm sure this is in jest.
Otherwise, I'd say you've clearly never been to, nor met anyone from the central valley, northern CA or much of the Sierra Nevada's. The majority there are solidly conservative. The problem is, they are out numbered by the libs along the coast and the big cities (much like Texas, New York, Florida, etc).
Northern CA tried to leave CA and start their own state with several southern OR counties (the idea of which was started by an Oregon mayor). It took the attack on Pearl Harbor to stop the process in it's tracks (at the time).
The northern counties that want to leave CA.
Their representation in the CA Senate
State of Jefferson
Meet the gun-totin’, bible thumpin rebels who want to split from California
A brief history on Jefferson (state)