According to Pew Research, “Very few voters are hearing much about third party candidates in this year’s election. A quarter of voters have heard of Gary Johnson, presidential candidate for the Libertarian Party, but only 5% have heard a lot about him. Fully 74% have not heard of him at all.”
The survey goes on to note 81% have not heard of Green Party candidate Jill Stein, and 90% have not heard of Virgil Goode.
The article was published on September 19, 2012. The information on third party presidential candidates is on page 5 of the online article and can be found here.