2008 (Barr) 0.4% (45 states)
2004 (Badnarik) 0.3% (48 states plus DC)
2000 (Browne) 0.4% (49 states plus DC, plus Smith in Arizona)
1996 (Browne) 0.5% (50 states plus DC)
1992 (Marrou) 0.3% (50 states plus DC)
1988 (Paul) 0.5% (46 states plus DC)
1984 (Bergland) 0.3% (39 states)
1980 (Clark) 1.1% (50 states plus DC)
1976 (MacBride) 0.2% (32 states)
1972 (Hospers) statistically insignificant (2 states)
While thrid party candidates have won some local offices, they did not have a meaningful effect on the presidential race. Straight Talk has summarized the results of the major third party candidates:
In 2004, Libertarian Party Candidate, Michael Badnarik earned .32% of the total vote with 397,265 votes and in 2008 so far, Libertarian Candidate Bob Barr earned 488,873 votes which equals to .40% of the total vote thus far
In 2004, Constitution Party candidate, Michael Peroutka earned .12% of the total vote with 143,630 votes and in 2008 so far, Constitution Party candidate Chuck Baldwin earned 174,634 votes which equals to .14% of the total vote thus far.
In 2004, Green Party candidate David Cobb earned .10% of the total vote with 119,859 votes and in 2008 so far, Green Party candidate Cynthia McKinney earned 142,785 votes which equals to roughly .12% of the total vote thus far.
These results are with 98 percent of the vote in so the popular vote totals might get a little higher for some but the percentages are unlikely to change significantly. Overall the third party candidates only received about one percent of the vote. As might be expected with a higher turn out, all four received more votes than their party four years go. They also have increased their percentage of the vote, but not by enough to be meaningful.
Many Libertarians were disappointed that the Libertarian Party nominated what they considered a conservative Republican ticket with Bob Barr and Wayne Allyn Root. Many voted for the nomination of Barr believing that, being better known, he might be able to receive a significantly higher vote total than previous nominees. It didn’t turn out this way as seen by a review of all the results for all of the Libertarian Party presidential candidates: