I don't know that much about him, since he's a first-term Congressman, but find it interesting that as a doctor, he's so offended by ObomaCare he's switching to the GOP.
Before you liberals screech shrilly that he was a Democrat in name only, or a "blue dog" Democrat.... a bit of history. There used to be a good number of conservative Democrat Congressmen and Senators especially from Southern states, that were fiscally responsible, ahem, conservative. Their numbers seem to be dwindling.
It wasn't so long ago that many Southern conservatives had a hard time voting for any Republican, since they were the carpetbaggers and reconstructionists. Even I can remember when I worked at the State Dept., where most career FSOs were very liberal one-worlders and trilateral pimps, many Southern democrats were the staunchest supporters of the military and Reagan foreign policy and much more conservative than many Republicans. The Republicans still have their "moderates" (liberals) but it seems the Democrats have few if any fiscal conservatives remaining.