Also Strange how Ossoff is underperforming Biden
Perdue probably outperforms Trump. He is less divisive and thus will probably do better in the Atlanta suburbs.
People make jokes about it all the time but the fact is that Johnny Isakson far outperformed Trump in 2016 precisely because he did way better in the suburbs. Given Perdue's genericness, it's not hard to imagine him also doing so, though definitely not to the same degree.
Isakson had a personal brand in the Atlanta suburbs that Perdue very much does not have. Perdue also has no history of doing all that great in the suburbs. In fact, he did worse in the Atlanta suburbs than Romney 2012! And he was running in an historic red wave!
Don't believe me? These are the shifts from 2012 Pres to 2014 Senate:
Gwinnett County: Romney +9.2 -- Perdue +10.4 (R+1.2)
Cobb County: Romney +12.4 -- Perdue +12.8 (R+0.4)
DeKalb County: Obama +56.6 -- Nunn +58.2 (D+1.6)
Douglas County: Obama +4 -- Nunn +5.7 (D+1.7)
Henry County: Romney +3.3 -- Nunn +0.7 (D+4)
Rockdale County: Obama +16.5 -- Nunn +19 (D+2.5)
Fulton County: Obama +29.7 -- Nunn +31.1 (D+1.4)
Clayton County: Obama +70 -- Nunn +69.1 (R+0.9)
Newton County: Obama +2 -- Nunn +2 (D+<0.1)
Cherokee County: Romney +57.5 -- Perdue +55.2 (D+2.3)
Forsyth County: Romney +62.7 -- Perdue +61.3 (D+1.4)
Not to mention that Democrats didn’t even contest Isakson's race.