In California, the GOP also lost seats in the legislature. In my district, Democrat Josh Newman ousted our Republican State Senator to became the deciding vote on the big gasoline tax increase that was just passed.
I suspect that many California Republicans may have stayed home because Trump wasn't going to win the state's electoral votes and the choice for US Senate was between two Democrats with no write-ins allowed--thanks to the "jungle primary" system that the voters approved recently.
Recall that bastard.