Define "For a long time now". The Republican party controlled California for 75% of the 1900s with the Democrats coming in power in the last quarter of the century. This is well after California established itself as an economic powerhouse which was greatly aided by the wild West attitude and things like Santa Clara being the location of 20 superfund sites due to all of the ground pollution caused by the semiconductor industry. California is also home to the greatest environmental disaster known as the Salton Sea. You are either going to have to concede that either the economic base of California was established by Republican and exploitative pro-business practices or that Democrats manufactured some of the worst environmental catastrophes.