Your best bet for fighting it would be the ACLU, obviously. But even they aren't taking on this one from what I can tell.
It's hard to accept the new reality of how much "civil liberty" we give up at airports in the post 9-11 world. I don't blame you for drawing a line, but my gut tells me you're eventually going to have to decide between your career and your civil liberty principles.
Call me "Brainwashed", but if the AITs stop one terrorist act in my lifetime, then all the screenings were worth it.
The "where will the line be drawn" argument is moot. We can fight new technologies as they emerge, and if a true consensus agrees it's gone too far, it can be halted right then and there. (the robot anal probe machine). The consensus agrees (at least tacitly) that this is not too great a breach of our liberties based on the benefit we receive.
Good luck to you though, that sounded like a really crappy day.