Biden is fairly moderate, low key, harks back to the no-drama Obama era.
Knows how an administration is run and knows everyone in politics, so can hit the ground running, which will be needed. Much, much better than more Trump chaos.
Biden works fairly well for these times, and doesn't frighten (m)any.
Clinton had her shot. Nearly won.
Do you think the US would be better or worse off if Hillary had been president the past 4 years instead of Trump?