"We need the federal government to stay out of our way and let people help people and businesses create jobs," Allen said in a statement announcing his decision to run Tuesday morning. "Sadly John Barrow believes in the centralized, bureaucratic model of big national government. That is out of touch with what works and out of touch with Georgia."
Barrow is the last white Democrat left in Congress from the Deep South, and Republicans hope they can finally knock him off in the heavily conservative district. But Barrow has shown time and again that he can win despite tough conditions. In 2012, he won by 8 points in a district Mitt Romney carried by 11 points.
John Stone, who Barrow beat by 30 points in 2008 in a district that was significantly more Democratic, is also in the race.
This post was updated at 3:20 p.m.