They had an election, and in California there was 1 vote for Trump for 1.52 votes for Harris [1] so even within one of the bluest of blue states, 40% of voters support the current administration.
California, like a lot of other "blue" states, turns deeply red once you get away from the cities and into more rural areas. It's just the cities have so many more people that they dominate statewide elections.
What's wrong with that? Do you think the popular vote should pick the president and half the country is ruled by people that prioritize living in a city and all that entails.
[1] https://en.wikipedia.org/wiki/2024_United_States_presidentia...