Rudey,
There was a good article in the Atlanta Journal Constitution about Bob Barr and how he's feeling pretty much the same way as you. He's still a Republican on some key issues, but he thinks that the party is getting away from its core mission.
It was just published a day or so ago, so if you go to
http://www.ajc.com and do a search for 'bob barr', you should be able to find the story.