Here’s an interesting site (via Daily Kos) which analyzes donations made to the presidential candidates. One section ranks the candidates according to donations along several criteria. The other section plots donations on a national map and allows you to sort by zip code, county, and state.
Based on my unscientific browsing, it appears that amongst the Democratic candidates, Tennessee is darkest for Senator Edwards–i.e., relatively speaking Tennessee is one of the stronger areas of financial support for Edwards. This shouldn’t be too surprising, given that he’s from neighboring North Carolina.
Take a look at the map. It’s cool to play with, and in some areas the results are surprising.