if one thing has been proven in the last four or so years, it's that the ability to give nice speeches with well constructed arguments and flourishes of fine rhetoric has no effect whatsoever...
it's been a downpour of eloquence from both the commentariat and from professional politicians, nonstop, and it's had zero suasional traction... as someone who works with words it's really disheartening but there it is
the electorate doesn't care about the tradition of high-minded oratory (Adam Schiff during impeachment giving speeches that thrill MSNBC hosts and get them gushing that these are political texts for the ages, speeches that will be studied by future generations)
regular folks go with their gut - a gut sense of who the person is, whether they understand them and are on their side
that's how Trump won, he got that across however disjointedly - that he understood his bases's fears, resentments, grievances
and that's the level on which Biden has a chance
he's not a communicator in the professorial way that media professional types (like me) appreciate - and loved about Obama, and also Warren - but he can get across the basic values with warmth and conviction