I don’t know if it’s Blagojevich who is leaking. Maybe it’s someone in the US Attorney’s office who doesn’t like the way that Fitzgerald is whitewashing Obama.
Another “Deep Throat” - worked once, could work again.
Actually, the explanation is probably much simpler than that.
It's not uncommon for folks who know (or think they know) really juicy information to want other people to know that they know. I'd bet there's a real rush in knowing that your inside information has made national news.