I enjoy listening to this man speak

Michael Badnarik

He was the 2004 Libertarian candidate for President. If I had to do it all over again I would have probably voted for him instead of leaving the presidential part blank.
Currently Mr. Badnarik is running for Congress in Texas as a Libertarian.
Youtube.com has more clips on his political campaigns. Mr. Badnarik also has constitution classes where he interprets the constitution, those clips can be found on youtube.com as well. I seen a clip of it and really enjoyed the presentation.
You can also get more info at badnarik.org