If the northern border of Georgia was moved 50 miles south you would get rid of the deep red mountain counties and some of the even deeper red northern suburbs, where most of the Republican votes exist in the state. What's left would be Metro Atlanta, the black belt and the coast.
Although I would be sad to cede the beautiful North Georgia Mountains, wouldn't this improve Democrats' performance in the peach state?
Isn't that kind of a pointless question? If you remove the most Republican part of the state of course its going to improve the Dem's performance.