In terms of real estate, that map overstates Democrat dominance. For example, without the cities of San Bernardino or Riverside, that big blue blob at the bottom would be orange.
True, and the two blue counties surrounded by orange in eastern California (Alpine and Mono), would be orange too if it wasn't for the wealthy Libs from southern California that moved to Mammoth Lakes ski area in Mono County in the last two decades and the Hippies from the Bay area that moved to tiny Alpine County (population around 300) to get away from urban areas. Except for the ski area town of Mammoth Lakes, Mono County is very Conservative.