It sounds like the Senate hearings went well for Nielsen. Check out this second press release by the NY-based ratings provider (bold highlights mine):
We were pleased today that representatives of both the Senate and the House acknowledged that local people meters are an improvement over handwritten paper diaries in measuring TV ratings. We were particularly heartened that Congresswoman Maxine Waters said she is "delighted" that Nielsen has proceeded with the LPM roll-out, that Senator Barbara Boxer said she is "very reluctant to throw Big Brother into the mix," and that Senator Conrad Burns said there was no need for legislation.
Clearly it is the view of the Committee that the private sector should work out any issues related to TV ratings and we are fully committed to working within the media industry to resolve any outstanding issues, just as we have in the past.
Dear Rupert: there is such a thing as going overboard!