http://journals.democraticunderground.com/... It's a summary of what he said at a town hall held at the University of Detroit shortly after the election. Pay special attention to what he says about impeachment:
"On impeachment: It is not practical right now. It will never succeed, as they don't have the votes. They would just tie up the legislative process for 4-6 months if they got bogged down in impeachment and they wouldn't get anything done. Then, of course, people would say they didn't get anything done and throw them out.
On the other hand, they will be issuing subpoenas to get answers on things they haven't been able to get answers on before -- the DSM, etc. If, after investigations, they start getting bipartisan support for impeachment, then who knows. Maybe enough pressure could be exerted from both sides that we'd have another Nixon situation and Bush would step down. (He did not specifically say this, but this was the jist of it.)
They're going to challenge the Patriot Act, wireless wiretapping. They will rewrite laws, hold hearings and correct defects."
I think he's been doing exactly what he said at that time -- subpoenas, investigations, etc. It's a long, painful process, but ultimately the truth will prevail.