Check out the map at the Beyond Red and Blue blog of third party strongholds from 1976 to 2004, when third party candidates tended to be liberal or libertarian protest candidates--for all you can say about Perot, he was certainly not interested in social conservatism. The South is where third parties go to die. It will be interesting to see how this plays out in a year with not one but two former Georgia Congressmen running for the Presidency as third party candidates.