Wrong. I’m not sure what your link is for: There are a lot of Red counties in California? Sure; Sierra County is bright red. It voted for Trump in 2016, 1048 votes to 601. Modoc County went for Trump 2696 to 877. Humboldt County, also in North Northifornia but home to several fine colleges (and a premier source of cannabis!), voted for Clinton 33,200 to 18,373.
@ DrDeth — examine the three triplets of numbers I just gave. Do the obvious arithmetics. What do you see?
San Diego County voted for Clinton over Trump 735,476 to 477,766.
I answered this in another thread. When I did the described study, I included Johnson votes in Trump’s total, Stein votes in Clinton’s total, and assumed 5% of blue voters would defect back to the GOP. (With this the blue margin in San Diego shrank to merely 162,267.) I still found it easy to get lots of blue states. Didn’t even need “gerrymander-shaped” boundaries.