Tallying up the national environment advantage Democrats have, and comparing it to the way the district voted in the 2012 Senate election and the 2014 gubernatorial election, Democrats ought to be a point or two shy from taking the district back. I think with a strong enough candidate however, and a wounded Republican party, it's entirely possible we see a Democratic win here.
Don't count on it. Trump's job approval is up to 10 points higher with likely voters than the public as a whole, and Congressional Democrats are even more unpopular in the same polls. Not to mention that they couldn't win the Georgia seat.
