Looking up TV listings for Jasper, it appears that cable carriers there still carry the Atlanta affiliates, so I'd disagree on how much they'd notice a candidate making a stop in Atlanta. In a popular vote system, I wouldn't expect any presidential candidates to stop in, say, Canton instead of (or even in addition to) Atlanta, when local media is going to pick up on stuff going on in Atlanta, so Atlanta's the closest I think Jasper would see.
That's fair, they might see it on the news if nothing more important was going on that day. But that's still press coverage, not a stop, and it's likely to backfire when the ad comes on saying, "But how much does Mr. Smith really care about Georgia?"
The more general point being that the dynamics of campaigning would be fundamentally different, such that none of the lines that are currently drawn will matter (and of course that's good thing).