By my calc, in the past four years of Census data, non-college whites - Trump's base - have declined from 47.0% to 44.5% (-2.5%) of the nation's voting age citizens, including:

AZ: 44.9% to 42.0% (-2.9%)
FL: 45.1% to 41.9% (-3.2%)
TX: 35.1% to 32.3% (-2.7%)

— Dave Wasserman (@Redistrict) July 7, 2020