I still think we are two years away from Georgia becoming a purple state. 2016 will be big here, and you have to think that if Johnny Isakson doesn't run for reelection (highly probable), Carter (or any Democrat) could be in a very strong position for the 2016 Senate race.
Isakson has said he is running again, but I don't buy it, either. He is sick, and has been for years. It's talked about here in inner political circles. He's always been a chain-smoker. I mean, take a look at how much he has aged since 2010. He's lost a noticeable amount of weight. I honestly wouldn't be surprised if he has cancer and hasn't said anything yet.