Why did the Pacific Northwest, in particular, fall so hard for Radical Leftism?

Why did the Pacific Northwest, in particular, fall so hard for Radical Leftism?
1 – Settled by Scandinavians – see wisconsin.
2 – Avoided black migration. The whitest and least black part of America – no perceived threat and easy virtue signaling.
3 – Seattle & Portland, like California, attracted transients like loggers, miners, and sailors while farmers etc, settled outside future Urban areas – producing union activism.
4 – 60s post college migration – Hippies to portland, Yuppies to Seattle.
6 – Flooding by Californians starting in the 1980s.
7 – Massive non white immigration of tech families by chain migration post 1990.
8 – White flight of conservatives.
9 – Seattle politicals looks to imitating san francisco.