one thing to bear in mind as congress fails to stop universal surveillance: the nsa has their communications. i think that, down the line, senators should plead blackmail: that's a better excuse than not being able to read the constitution they have sworn to uphold, or quite intentionally and globally violating it. no need for explicit arm-twisting; all the intelligence dickheads have to do is blandly raise an eyebrow at a senator, or not even that.