Interesting. Was Craig involved in a recognized constitutional "breach of the peace"? Would the Court take that position?
U.S. Constitution, Article I, Section 6. The Senators and Representatives shall receive a compensation for their services, to be ascertained by law, and paid out of the treasury of the United States. They shall in all cases, except treason, felony and breach of the peace, be privileged from arrest during their attendance at the session of their respective Houses, and in going to and returning from the same; and for any speech or debate in either House, they shall not be questioned in any other place.
As far as I am concerned, the Senator comes off looking worse and worse the more he tries to dig himself out of what is pretty open and closed to the average joe. He did something wrong and pled guilty to it.
It may turn out that he should not have been detained, should not have been convicted, etc., etc. But he still did what he did.