 What I'm about to suggest is not based on any claimed insider sources, which I wouldn't trust anyway. It is based purely on the sheer unreasonableness of intelligent political operatives to pick and promote someone as useless as Biden, unless they have some overarching dark ulterior motive for it. It's that simple. They aren't dumb, they aren't stupid, and they have many other more credible, controlled politicians to run for president. Why not use them?