There are conflicting accounts and speculations on the Walpin IG matter. I have a rule of thumb for piercing the darkness in such things: assume everyone involved is lying, at least somewhat.
You'd be surprised how revealing that can be. So take as a starting point that everyone - Walpin, Obama, Eiser, the Americorps board, KJ - is shading something. How Senators Grassley and McAskill might be lying escapes me at present, because they are in the question-asking side of things, but we shouldn't rule out that possibility and extend them infinite trust just because they say they are reformers either.
And don't forget the various media figures and organizations involved. Assume that all of them are leaving out key parts of the story as well, and reframing and redescribing what they do report. The critics and defenders of Obama both. View them all with more than suspicion.
When I reviewed the material through this prism, it looked quite different.
And Obama looks very, very, bad under this assumption, no matter how the threads get untangled.