Not all of CA. The conservative counties in the North State want nothing to do with secession and detest the liberal ruling class in Sacramento.
For decades, many in the northern counties--Shasta, Siskiyou, Modoc, etc.--have wanted to form a new state called Jefferson. Perhaps some of the "red" counties farther south--Kings, Kern, Inyo, Tulare, etc. could break away and form a new state called Coolidge.