Yes, gaffs are as old as time, or Joe ;) in his long history.
If he resigned she would become POTUS & I think make it easier for her to run.
I think Joe & Jill have old resentments with Obama over Hillary. So the thought of him & Nancy talking with them I think wouldn't go down well.
Nancy & Jim Clyburn would be the ones to talk to them.
Or maybe just Jim.
Do something positive.