I had read that he was a Democrat, but perhaps I merely read that from another poster and assumed it was true and repeated it. In looking now, I can't find any information on his official political affiliation. Do you have any specific information on this?
His background -- from Brooklyn, parents first generation Irish, went to Harvard Law School. Was appointed US Attorney by this administration. Seems utterly apolitical in his career so far. Guess one can make what one will of that.