Most California citizens DON'T WANT THIS, it's the politicians who push it.
I'm not sure you can say "most" Californians don't want stoop labor for the agriculture section of their economy. Agriculture is very important to the state's economy and you can't do it all with machines.
There are even a lot of conservatives who ordinarily are against illegal immigration who understand that there has to be some kind of guest worker program. BUT you don't need to give them citizenship.