I have heard about Dems retiring or not running, typical when the writing is on the wall.
Ok, just looked and R’s are defending 20 seats vs. 14 for Dems. But, you’re right. Biden’s lack of progress on the radical agenda will probably keep them home, and his general performance on Afghanistan, COVID, etc, may piss off middle-of-the-roaders.
Senate races are statewide, unlike House races, so if the Dominion/mail-in fix were bulletproof, they wouldn’t be jumping ship.