Ah, Roland Burris. What happens next?
This is different from the debate on seating, with each house judging its own members, which is procedural. Barring a resignation by the egomaniacal freak, the matter falls under the same Article 1, Section 5, which rather unhelpfully provides that "Each House may determine the Rules of its Proceedings, punish its Members for disorderly Behaviour, and, with the Concurrence of two thirds, expel a Member."
The framers and commas, not so much. You know, the whole "well-regulated militia" thing? The question is, you can punish for "disorderly conduct," but is that operative with regard to expulsion? If so, what is disorderly conduct??
We have no predent to decide this. The Senate has not expelled a member since 1862, and every expulsion to date was because they were TRAITORS. One in the 18th century, and then that whole Confederacy thing.
[On that note, with apologies to my southern brethren--I still fervently believe that every senior political official of the so-called Confederacy should have been hanged as traitors, along with every commissioned officer in the so-called Confederate army. You do not make war on this nation lightly. I applaud Lincoln with his "malice toward none" approach, but if it had been me, malice all around! Treason should be painful.]