In the primaries you mean?
The key desire for a lot of voters seemed to be “Obama presidency 2.0”
I suppose there is some familiarity, but they would probably have been better off with asking Hillary to run again.
I know Obama 1.0 didn't actually work out very well, but at least Obama ran as the change candidate. Biden can't even change his clothes without help.
Still, there's time to change it and give Trump some competition or this will just be a walkover.