easily explained hm.
Biden is so used to playing second fiddle that in his weakened state of mind doesn't remember that he's running to be lead dog this time and Harris, well, after her butt chewing on Biden during the debates you can figure that she's hoping and praying that Biden makes it no longer then he has too just to get her in. Heck, I wouldn't put it past her and other Dems to see to it that Biden gets a little extra sleep aid in his drink when the time is right, if ya know what I mean..