Nick Beaudrot makes a map showing Obama's performance county-by-county across South Carolina. Due to the scale of his victory, it's not actually a very interesting map (though that, of course, is an interesting finding). This map is more interesting, but I daren't try to explain exactly what it's a map of.
This article available online at:
http://www.theatlantic.com/politics/archive/2008/01/mapping-south-carolina/48192/
