If Sullivan does go that route, max 6 months otherwise he has to empanel a jury, and that just isn't done for criminal contempt.
Federal Contempt of Court By Joel M. Androphy and Keith A. Byers
-- I think he beats the contempt charge by documenting the lies of the gov in convincing him of a guilty plea. --
Sullivan's MO is to do the damage, then rehabilitate himself by doing the right thing. He did that in the Ted Stevens case. Drag it out, make the accusation legitimate, Stevens loses his seat then Sullivan suddenly and without warning notices prosecutorial misconduct.
Wow! I will be watching what he does....