Hillary got 22,000 more votes in 2016 than Obama got in 2008.
Four years later, Brandon got 454,000 more votes than Obama 2008.
We're expected to believe that Basement Biden added 114,000 votes per year when the population was only increasing by 60,000 per year - half of which were non-voters [aka 30,000 voters per year]? 
oblabya 2008 mclame 2008 total hitlery Trump 2016 total biteme Trump 2020 total
Virginia 53% 1,959,532 46% 1,725,005 3,723,260 50% 1,981,473 44% 1,769,443 3,984,631 54% 2,413,568 44% 1,962,430 4,460,524
“Half of which were non-voters [aka 30,000 voters per year]? thinking face.”
Your right, it is crazy to think that well the population grown by 240,000. Not taking into account, at least half are non-voting age (children), a large percentage will be republicans (46% worse case), only around 60% (best case) of them will vote, etc...
Once you start dividing down the growth into categories it becomes a fairly small amount new Dem voters, nowhere equal to 500,000.