This map also shows it. Southeast Los Angeles used to have tons of "ethnic" working class white voters. Areas like Paramount, South Gate, Norwalk, Downey, etc. are now largely Latino. Some of the white old folks are still there (my grandma and godmother among them) and actually hold quite a bit of sway in low-turnout municipal elections.
But prior to the transition, the areas had pretty reactionary politics.
Prediction: much of Northern Orange County and nearly all of San Bernardino and Riverside Counties are going to have similar voting patterns unless there is some sudden nationwide political realignment...its already starting to happy Assemblymembers Fox (Palmdale) and Quirk-Silva and Congressman Takana and Ruiz...
Pretty soon all of SoCal may look like Massachusetts, except a small swath of Northern/Eastern San Diego and Southern Orange County.
