Oath of Office

Every senator and representative takes this oath of office:

"I do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter: So help me God."

It seems to me that by ignoring or condoning Bush's  violation of the Fourth Amendment, all Senators and Representatives, with the exception of John Conyers and Russ Feingold, have violated their oath of office.  They have done this for purposes of evasion,  i.e. political cover.