It is easy to see, from this map, why the political power in Virginia has shifted. The map, courtesy of Sabato’s Crystal Ball, shows the population of the Commonwealth.
Compare that, if you will, to that produced after the last census. It is easy to see the growing influence of Northern Virginia.
One last map: that of the regions as they are actually sized. There are a lot of people living in NoVA
As always, click to enlarge.