Most of the south isn't a southern stereotype. The DC metro is more like a new england city than either of the two you mentioned. This paper is based out of southeastern VA, in the VA Beach and Norfolk area.
That said, I'm surprised the comments are so cordial. I agree with the analysis that the fact that it's mostly UVa alums/students and interested parties commenting contributes to the higher level of discourse.
Know what? They are.
I would encourage you to compare any east coast city against any other. Then I would encourage you to compare an underpopulated area in Maine against an underpopulated area in Tennessee.
The difference between the DC area and all of the other cities in the South is that the DC area was actually the dividing line between the Union and the Confederacy.