SAVANNAH, Ga. — In the past three years, Rep. John Barrow has outraged fellow Democrats with his vote against President Barack Obama's health care overhaul and been attacked by Republicans for refusing to support a full repeal. And the deep South's last white Democratic congressman is still defying both parties with his stance on the law. Before Congress adjourned Aug. 2, Barrow was among just four Democrats who sided with House Republicans voting to gut a key part of the Affordable Care Act that puts the Internal Revenue Service in charge of enforcing certain mandates.