BTW - the Arlington and Alexandria numbers demonstrate how Virginia is gone for Republicans.
This is what typically happens in Virginia that is spurring population growth.
Step 1) People move into DC from wherever.
Step 2) They move to Arlington/Alexandria (sometimes this is Step 1)
Step 3) They want more space and move to Fairfax
Step 4) They want more land and move to a county further out.
Those insane D vote margins in Arlington and Alexandria will be Fairfax voters in 5-10 years. They will also be replaced by DC people who are super liberal.
NOVA = getting more populated + getting more Democratic. Republicans have NOTHING to counter this in Virginia. They are already maxed out downstate and Southwest Virginia is losing population. This is why I am 100% confident Republicans won't win Virginia anytime soon.
Hillary Clinton won the popular vote by about 2 points. Kaine helped her in Virginia, and Trump was a horrendously bad fit for NOVA. She still won by a little over 5 points, which is not a huge margin. A Republican win in Virginia is definitely not out of the realm of possibilities. This kind of overconfidence coming from Democrats is part of the reason why Trump won.