Libertarians have reduced their field of presidential candidates to three after four rounds of voting at the Party's national convention in Denver.
The remaining candidates are former Georgia congressman Bob Barr, Mary Ruwart, and Wayne Root.
About 650 delegates are voting in Sunday's national convention.
The Libertarian Party started with 14 candidates for the top political job.
Barr left the GOP in 2006 over what he called bloated spending and civil liberties intrusions by the Bush administration. Former Alaska Sen. Mike Gravel was also among the candidates before the list was narrowed down to three. Gravel dropped out of the Democratic presidential race.
The Libertarian Party is the third-largest in the country with 250,000 registered members.