The thing is, Gardner "condemning" Trump or "apologizing" for his voting record would result in Gardner losing a ton of Republican votes and winning over a completely negligible number of Biden voters. The (boring) truth is that Gardner was always going to be a one-termer unless you thought that this was going to be a Republican wave year and that he would be facing an opponent far worse than Udall.
It could still be if the economy is already "close" to full employment by November (say under 8%) and Biden runs a really bad campaign. Maybe even then, Gardner would Hick to be a bad candidate and perhaps he's not a good candidate but he is OK no matter how you slice it...maybe just OK but that's not weak enough.
