Libertarian Party presidential candidate, former Rep. Bob Barr, R-Ga., speaks at a campaign stop in Centennial, Colo., Friday, Oct. 17, 2008.(AP Photo/Ed Andrieski)

Libertarian Party presidential candidate Bob Barr speaks at the National Press Club in Washington, Friday, Sept. 5, 2008. (AP Photo/Haraz N. Ghanbari)

In this May 12, 2008 file photo, former Republican congressman Bob Barr poses for a photo before speaking at the University Club in Washington. Barr's Libertarian Party bid for the White House is the longest of long shots, but political experts say he may be able to exploit the unease some die-hard conservatives still feel about Sen. John McCain, the Republican nominee-in-waiting. Combined with the surge in turnout among Democrats during the primaries, they see what could be a recipe for trouble for the GOP. (AP Photo/Jose Luis Magana, File)

In this May 12, 2008 file photo, former Republican congressman Bob Barr poses for a photo before speaking at the University Club in Washington. Barr's Libertarian Party bid for the White House is the longest of long shots, but political experts say he may be able to exploit the unease some die-hard conservatives still feel about Sen. John McCain, the Republican nominee-in-waiting. Combined with the surge in turnout among Democrats during the primaries, they see what could be a recipe for trouble for the GOP. (AP Photo/Jose Luis Magana, File)

In this Nov. 17, 1998 file photo, then-Georgia Rep. Bob Barr, a member of the House Judiciary Committee, talks with reporters on Capitol Hill in Washington. A fiery former GOP congressman who gained national prominence for doggedly pursuing the impeachment of President Clinton, Barr has some Republicans worried that he'll play spoiler in a tight presidential contest (AP Photo/Dennis Cook, File)

In this May 12, 2008 file photo, former Republican congressman Bob Barr poses for a photo before speaking at the University Club in Washington. Barr's Libertarian Party bid for the White House is the longest of long shots, but political experts say he may be able to exploit the unease some die-hard conservatives still feel about Sen. John McCain, the Republican nominee-in-waiting. Combined with the surge in turnout among Democrats during the primaries, they see what could be a recipe for trouble for the GOP. (AP Photo/Jose Luis Magana, File)

Jeri Dobbin, left, looks on as her husband former Republican congressman Bob Barr accepts the Libertarian Presidential nomination at the Libertarian National Convention, Sunday, May 25, 2008 in Denver. The Libertarian Party picked former Republican congressman from Georgia to be its presidential candidate after six rounds of balloting. (AP Photo/Will Powers)

Jeri Dobbin, left, looks on as her husband former Republican congressman Bob Barr accepts the Libertarian Presidential nomination at the Libertarian National Convention, Sunday, May 25, 2008 in Denver. The Libertarian Party picked former Republican congressman from Georgia to be its presidential candidate after six rounds of balloting. (AP Photo/Will Powers)

Wayne Allyn Root, left, and former Republican congressman Bob Barr talk to their supporters and the media for the Libertarian Presidential nomination after Root through his support for Barr at the Libertarian Convention in Denver, Sunday, May 25, 2008. The Libertarian Party picked the former Republican congressman from Georgia to be its presidential candidate after six rounds of balloting. (AP Photo/Will Powers)

Former Republican congressman Bob Barr poses for a photo before speaking with the media at University Club in Washington Monday, May 12, 2008. Barr launched a Libertarian Party presidential bid, saying voters are hungry for an alternative to the status quo who would dramatically cut the federal government. (AP Photo/Jose Luis Magana)