Bob Barr (former Congressman) a libertarian for President.
Bob Barr 2008 — Liberty for America
With Ron Paul stepping down, can Bob Barr become a write in libertarian candidate in those states that don’t have his name on the ballot ?
Petraeus Testifies, Penn Steps Down, Barr to Run? : NPR
US News: National news and politics at THEWEEKDaily.com (http://www.theweekdaily.com/news_opinion/us_news_opinion/38445/a_libertarian_nader.html - broken link)
I’m not sure if Bob Barr or a libertarian is an answer, but it makes the race a little more interesting when looking at the others running for office in the news.