My armchair cynic theory is that RFK negotiated with Trump to drop out and endorse him, in exchange for appointment as EPA head or some policy concession. Meanwhile, disaffected by poor performance and his refusal to drop out, the youth vote and other key Biden demographics either stay home in outsize numbers, or vote for Jill Stein or Cornell West. Trump would win every swing state and possibly some others if that plays out.

Biden needs to go.