Writers have egos. King makers have immense egos. The man must be seething when Obama takes credit for his thoughts, then throws the king maker under the bus.
There seems to be a difference between ghost writers / speech writers and people like Ayers who have really shouldered this guy. I guess it would be like one of my professors taking care of my college, career, books, wrote out my plan for the white house, set me up with everything, do everything and then I tell the world he was scum and I hated everything he stood for.