As long as people remember that, there's no problem. But there's a danger of people taking him seriously as a prognosticator and - worse - arbiter of policy just because dKos has been so successful. And he really isn't qualified for either of those roles.
Rep. Waxman can investigate anything he wants, issue subpoenas whenever he want, and either he gets the info or the non-responder goes to jail (British: gaol.)
The rest ... as he said.