Incorrect.
Virginia requires ID. We also have a governor who has been fighting the courts to successfully remove ballot access from noncitizens.
Northern Virginia also has about twice the population it had prior to 9/11. The federal wealth transfer of the last 23 years has funneled unbelievable amounts of money here. It's been nonstop gigantic construction projects the entire time.
I am pretty convinced that between good old fashioned federal graft (and the knowledge that this now might end under Trump), an abnormally high immigrant population, and an overt attempt by the Virginia Republican Party to turn the state into a literal fascist state that literally bucks SCOTUS, it's just a place that has been massively mishandled for the last 20 years and the 200k extra blue votes are probably legit.