This is focused on California politics. But even so, energy, utilities, real estate, entertainment, agriculture, and healthcare have a lot of influence on California politics. Tech is most likely not the biggest if you look at lobbying data.
Not to mention the movie industry.
You mean the industry that has practically relocated to Vancouver, Toronto, and Georgia due to the aggressive tax breaks those governments give, which the governors and legislature have been refusing to do for a decade?
Almost nothing is filmed in LA county anymore.