Weirdly I heard that CA 33rd which isn't even that blue only moved like half a point left. What Demographics are there that helped the GOP? Its a 70% White district that was "only" Clinton +40 in suburban Los Angeles.
First off, it isn't really suburban. Basically, it's the most "elite" part of Southern California if not the entire United States. It has Beverly Hills, Bel Air, Santa Monica, Marina Del Rey, Malibu, etc. which are basically our version of Uptown Manhattan+the Hamptons. It also has a sizable Jewish and Iranian Community (heavy overlap between the two) and iirc one of the highest Japanese populations of any district in the USA.
Spot on, it's just rich people playground basically, at a certain point only so many dems can end up in there with the old money holding the rest of the ground.