On July 17, 2003, following a briefing by Cheney, Sen. Jay Rockefeller responded with a handwritten letter (pdf). How prescient. Markos at Daily Kos has the text version. Here's a portion of it:

Clearly the activities we discussed raise profound oversight issues. As you know, I am neither a technician or an attorney. Given the security restrictions associated with this information, and my inability to consult staff or counsel on my own, I feel unable to fully evaluate, much less endorse these activities.

As I reflected on the meeting today, and the future we face, John Poindexter's TIA project sprung to mind, exacerbating my concern regarding the direction the Administration is moving with regard to security, technology, and surveillance. Without more information and the ability to draw on any independent legal or techical expertise, I simply cannot satisfy lingering concerns raised by the briefing we received.

I am retaining a copy of this letter in a sealed envelope in the secure spaces of the Senate Intelligence Committee to ensure that I have a record of this communication.

Patriot Daily has a great round-up of liberal blogger reaction to the unauthorized spying.