To be fair, the US Attorney is advising that, at this point, Obama appears to be in the clear with regard to the charges.
However, the Blagojevich connection is merely the latest in a long line of troubling associations for Obama: Rezko, Wright, Ayers, etc.
Either he's a very naive man, who can't see obvious moral failings in his associates or he's content looking the other way in the face of wrongdoing to gain political advantage. You have to wonder whether the judgment he's displayed in his associations in the past, will be a prologue to how he conducts himself as president, especially when you see his picks for AG and Secretary of State.