Both parties now get most of their votes from either urban or suburban voters. The GOP gets most of its votes from suburban voters while the Dem get most of their votes from urban voters. The fact that the suburbs in the South are fanatically GOP has always been a major factor, but last year there was suddenly a surge in rural support for the GOP in the South as well, and the two "regions" are now on par with crowding out the urban areas.
True about where the votes come from.
There was certainly a surge in GOP support in the Presidential election in the rural South especially, but it's interesting that with a few exceptions it didn't really flow downballot a great deal. Whether it's a longterm change or a reaction to a blatent "Northeast Liberal" being nominated I'm not sure.
We'll find out soon enough
Strange that a year old discussion hath started up again though.