A merge of data from the NBC News/Wall Street Journal July and August polls shows Johnson and Stein are pulling about 15% of the vote in the four-way race with Johnson winning 10% and Stein capturing 5%.

But as the homestretch the campaign nears, it’s unclear how firm those Johnson/Stein voters are. In 2012 Johnson and Stein were both on the ballot and when all their votes were added together they earned about 1.5% of the popular vote.

Registered voters who favor Johnson and Stein have a pretty specific profile.

Johnson and Stein supporters are young. For both candidates more than half of their supporters, 51%, are 34 years of age or younger. They are not particularly diverse. More than 80% are white. And supporters of both Johnson and Stein give much higher “positive feeling” ratings to Bernie Sanders than they do to Clinton or Trump.