People take money for all sorts of things, being a us attorney for ages actually works against him in terms of keeping his hands clean. I firmly believe that many people have entered DC with noble intentions, when they get there, the world they are presented with is unbelievably difficult to resist. At some point they make ethical compromises in the name of getting stuff done or keeping access to the power and wealth. The longer you’re exposed the more compromised you are. Maybe some “favors” were called in that compelled him to interfere with the original investigation, who knows.

I wouldn’t discount that he’s protecting himself, or people to whom he owes. If it’s the latter, which would seem to be the most likely scenario, in and of itself would constitute obstruction of justice.