The Honorable Thing to Do...

...is for Senator Shelby to resign. (hat tip: VodkaPundit) This kind of leak is no more defensible than Joe Wilson's or Sandy Berger's offenses (though probably less damaging than either of those cases), and if Shelby will not resign, the Senate should remove him. If the Senate also fails in its duty, the people of Alabama have a duty to vote him out at the next election he stands for.