If you want Calfornia to become liberal your going to have to do four things.
1. Make college campus's more liberal
during the 1960s the counter culture movement, hippies, feminists, various power groups essentally went crazy and ended up in charge of the henhouse. At first things were fine and then the movement became very ugly with various student activist groups turning on normal students who just wanted to study and each other.
It all came to a head during the berkly riots where student activists killed 12 students who didn't want to join a protest by burning them alive....
The state pretty much purged them and black listed any one with a history of political activism, to this day california colleges are very a political, but we have a lot of them and if they were more liberal that could swing the state.
2. Prevent Brown from becoming governor.
Brown was the one who firmly posioned the well for democrats, not cracking down on riots, reining in student activists and running the economy into the ground. It took 10 years for the state to fix the damage, and we still haven't forgotten that.
3. Prevent immigration from east asia and eastern europe.
California accepted a lot of refugees from communist china, from vietnam, north korean escapies, we also got a lot of imigrants from poland and eastern europe during the solidarity protests, which turned into the solidarity massacers. To this day at least a 10th of the states population is formed from people who either escaped communism or who's parents escaped communism.
This is not a group of people who are going to have friendly feelings to anything that smells remotely like communism.
4. Have the republicans lose the black vote
The republican party sent the freaking airborn to desegergate schools, and successfully passed the civil rights act of 56 which convinced a lot of african americans to stay with the party. Theres also the fact that the african american community loathes illegal imigrants and sees them as computition for 'their' jobs. However even then this could have been salvaged...
Except for the LA riots.
Things used to be better between the latino and black communities before that happened.
(Started when an african american officers beat up a latino man who was resiting arrest on TV)
Saw black store owners having to stay on roof tops with shot guns, and La rassa protestors burning down much of compton, the black community has never forgiven or forgotten that incident.
Take away these 4 things and it wouldn't be that hard to run the state purple if not a deep blue.