CA-48 also has a much higher college-educated population. About 53% of people in CA-48 aged 25 and older have a higher degree compared to CA-42 which is about 34%. Having a post-secondary degree has become increasingly correlated to Democratic voting habits, and in 2016 it was one of the most indicative factors of whether an area trended Democratic or Republican.
Why are the Orange County suburbs so much more college educated then the Riverside ones then?
More expensive housing, better quality of life.