Obviously, most did regret it, or his own party wouldn't have taken him out behind the barn because they were sure he couldn't beat Trump again because he was such a failure.
And it's no "burn" on Trump that Hiding Biden won. No Democrat has to work hard. The lying media does the work for them. That's why Biden's toughest question was "What flavor of ice cream are you eating?" until it was clearly that Trump was going to beat him. Then, they jumped in with the Dem elites to kick him out.
The only question now is are those voters stupid enough to make an even worse decide than they did in 2020? If not, the beatings will continue.