David Nolan, who helped to found the Libertarian Party and ran in recent years for House and Senate, died unexpectedly last Sunday, the party confirmed this weekend. 

Nolan, who was 66, lived in Tucson, Ariz., and reportedly experienced a fatal heart attack or stroke while driving his car.

A life-long supporter of libertarian and conservative causes, he ran for the House as a libertarian in 2006, receiving about 2 percent of the vote in Arizona's eighth district. This cycle, he opposed Sen. John McCain's (R-Ariz.) bid for reelection, again as a libertarian, and received about 5 percent of the final vote.

As a college student, Nolan had supported Barry Goldwater's campaign for president in 1964. He later worked on a constitutional amendment to eliminate the federal income tax.

The Libertarian Party was founded by him and others in the early 1970s.