From the NY Times Op-Ed page today:
In the current case, however, at least two senior officials are said to have approached at least six journalists to identify the C.I.A. officer. Any of those individuals has the power to resolve this episode and still maintain “plausible deniability.” They could do so by confiding who their source was to another reporter who did not receive such a call. This would be justifiable in moral and political terms, because this counterleak would be serving larger public purposes, not narrow political advantage.

All the gory details will come out eventually in this case. Too many reporters know who the leaker was to keep it a secret. If the “Justice” Department’s “investigation” turns up nothing I bet we hear whispers of names within a day.