All are good, the county by county one that shows large swaths of red with dots of blue in it is one part of the story, but there are so many ways to show the data so you can get a real picture on the makeup of america and how we vote.
I'll start with this one
Best one I've see yet.
Shows you that republicans are relatively low population, but make up for it in area.
Democrats are small in the area but huge pinpoints of votes that make up the difference.