Statistical measures of polarization has California quite high. For example:

research.bshor.com/publ…

If you look at the graph on page 6, The CA Dems are the furthest to left of any State and the CA GOP is the furthest to the right of any State, except Texas and Oklahoma.

Though the other axis of the graph shows that CA voters are actually further left and and further right than their lawmakers! Hence your perception that legislature is moderate.

California legislature: Extremely polarized

California voters: Even more polarized