There are districts in LA, Philadelphia, Boston and NY that go 95% Democrat. Most Republican districts in flyover country are 55/45. The 12% number is meaningless.
Heck, in Caliph-phony-a, the last two Senate races have been a semi-moderate Democrat versus a crazy Leftist "Democrat". Last time, the Leftist, Kamala "Not the Ugandan Giant" Harris, won. And if you've been following the Kavanaugh lynching, she's been front and center in the a$$ clown section.
This year, it's Chinese Dianne Feinstein versus Kevin "Ponce" de Leon. Lord have mercy on our state!