For history buffs: If the Dems win, then the circle is now complete. Here's the result of the last big upheaval in GA state-race politics (Dems did win in GA after this in the 80s and 90s but previously it had basically been a Democratic stronghold; this election shifted it to a battleground, just like the 2020 election did):
https://en.wikipedia.org/wiki/1980_United_States_Senate_election_in_Georgia
Long time segregationist Democrat Herman Talmadge against Republican empty suit Mack Mattingly. Talmadge obviously had won all previous elections easily but he had some financial conflicts of interest (quite like Perdue and Loeffler) and never really backed off his blatant segregationist positioning, which combined ended up being a bit too much even for 1980 Georgia.
Check out the county results - practically an inverse of what we have now. Mattingly, a down-the-line Reagan Republican (not some Rockefeller-type) actually carried Atlanta. This showed that Democrats who wink at the KKK might have trouble getting the African American vote. In spite of that, Talmadge still was able to win about 30% of the AA vote, which shows how useless Mattingly was on that front. That would be like someone running against Hitler, and Hitler still getting 30% of the Jewish vote. Still, Mattingly was able to sweep the Atlanta metro, via suburbanites excited about Reagan and fed up with the rather ridiculous and racist Talmadge and the majority of AAs giving the finger to Talmadge.
Mattingly was basically a non-entity and lost in the next cycle, but it's interesting how parties and politics seem stable for a period, then suddenly shift.