Why is the West Coast so left wing?

[Bo]

Many conservatives left the area in droves in the 1970s, 1980s, and 1990s.

[Bo]

Also the influx of minorities in the last three decades made the West Coast more left-wing.

[Bo]

I think that the main reasons are that as many conservatives left, many minorities moved into the West Coast, a trend which begun in the 1980s. Also, I think that as the GOP began to place focus on issues such as abortion, gay marriage, and illegal immigration, many previously Republican voters became alienated by the GOP and began to vote for the Democrats more often.