In a landslide election demographics don’t matter.
I lived 36 years in Fairfax County and watched it change from a Rep stronghold to a Dem power base. Kerry won Fairfax for the first Dem win in 40 years. It has become increasingly Dem as has NoVA. One third of Fairfax County is now foreign born.
Take a look at how the demography of VA has changed since 1970.