I don't know if that would have happened in 2020.
MAYBE.
I don't know.
They desperately wanted Trump gone, so they were pragmatic enough to nominate Biden. But at the same time, he really blew it. To tie down support he made a promise he never should have made: "I'm going to pick a woman running mate."
And then when the country erupted in protests, fires, riots, and the very same people saying "six feet apart" excusing protests "because this is important," he was basically forced to choose between Harris, Susan Rice, Karen Bass, or Stacey Abrams. I still surmise Klobuchar was his choice, but after the killing of George Floyd, there's no chance he could choose the former prosecutor in MSP.
I give Biden a pass only on the point that very few nominees ever pick the "best qualified" person to succeed them. But most at least pick someone minimally qualified, even if the only qualification is "can give a pretty sounding speech."