Right to bribery

Ted Stevens (R-AK) asserts in his defense the right to accept bribes. He says that Article I, Section 6 of the Constitution forbids his trial. Here's the text:

[Senators and Representatives] 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.

That's the Republicans for you. Separation of powers means to them that Congress can't oversee the Executive, but the Executive can't stop Congress from corrupting itself. Hoo-boy, all pigs to the trough right now!