C if he loses, A if he wins
"Good campaigns are when you win and bad/mediocre campaigns are when you lose"
Not exactly, but that's a huge piece of it. His campaign has been pretty good, but the reason he's probably going to win while Harrison, Bollier, and Gross probably lose has more to do with Biden and Trump than any of the Senate candidates.
I should clarify that the letter grade should really be more based on his margin relative to Biden's, but I'm working under the assumption of a narrow Biden win in GA Tuesday.