Six new Liberal Senators, maybe, but the remainder would almost certainly reflect the much more conservative values of the “red” parts of California.
Splitting California roughly along the San Andreas Fault may be a more rational way to divide that tormented land. Of course, a fairly wide buffer zone would have to be established as well, to be sure San Francisco would not be accidentally included in part of the “northeastern” section.
I’m sure the liberal power structure would gerrymander the new states along liberal lines.
I'd vote for that!