Earlier quoted context omitted.
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.
I grew up in the DC area (Virginia side), and myself and others there never considred it "the South." I always thought of it as the dividing line between North and South. This always seemed natural to me, since Virginia seceded in the Civil War, and Maryland did not.
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.