In the US Congress there is one- Ron Paul.

Is there now one in the US Senate?

Robert D. Novak:
Senate colleagues dislike Dr. Tom Coburn?s Rx
By ROBERT D. NOVAK

DR. TOM COBURN, a U.S. senator from Oklahoma for less than four months, last week was up to old tricks he started playing in the House a decade ago. He was making colleagues? lives miserable by exposing wasteful, unnecessary spending that is supposed to stay hidden. The Senate establishment, like its House counterpart, has retaliated by bringing ethics charges against the obstetrician-senator for going home to Muskogee, Okla., to deliver babies.

I am not really sure yet, but it would be a start...

--WP