Very nice...any chance you can provide a % change (fall) map?
EDIT: That might be difficult, though...unless you do an overlay of the maps. If only there was an Atlas script to do that, but that would be rather complex.
I was bored, so I did it by hand, as I could not for the life of me find any other way.
Here's the percentage change in Democratic support in Texas (blue is down, red is up):
There were only four counties in which Democratic support actually increased: Dallas, Fort Bend, Loving and Travis.
I won't do any analysis of this; I'll leave this up to you guys.