Aren't school taxes raised through property tax levies? In this age of mass immigration in CA, isn't this literally immigrants flexing their new numerical and political muscle. The only immigrants who will vote against this (in a small bloc) are those who see past the BS that will be spouted and understand that their rent will increase when school budgets increase. Immigrants who own homes will fall within regular splits for or against any budget.
In California, a large proportion of sales taxes also go to education, as well as from the state general fund. CA spends a lot of money on schools for little return.