Eliott Spitzer is the Attorney General of the State of New York. This subpeona was issued by the US Attorney for the Southern District of New York (a position once held by Rudy Giuliani, BTW). It is a completely different person. Used to be Mary Jo White. Don't know who is in that position now.
Spitzer is a political hack with a long a tawdry history of headline grabbing politically motivated prosecutions. But he is not involved in this particular case.
after posting, I looked it up .. a guy named Michael J. Garcia is now US Atty for SDNY .. Spitzer is the one I was thinking of but thought he was state v. federal. I still doubt that this is much of a case, but one never knows.