If Barr does as well as Perot(unlikely but let me have my fun) Obama winning Louisiana isn't out of the question.
Barr will not do as well as Perot. At this point I doubt he'll even do as well as Nader did in 2000. If Barr pulls in around 5%, McCain absolutely craters, and Obama runs a perfect campaign, I could
maybe, maybe, maybe see Obama winning Louisiana or Georgia. LA isn't as de-blacked as everyone thinks: most of those displaced by Katrina just went to other parts of the state, and at least some whites were displaced also. Georgia has a few white liberals and moderates in Atlanta and the surrounding areas, most of whom are transplants from other parts of the country. However, barring a perfect political storm, McCain will win both states by double digits.