I read here all the time that a vote for Johnson is a vote for Clinton. What's funny is every Clinton supporter I've interacted with says a vote for Johnson is a vote for Trump. Polls that include the 18-34 age group (unlike the CNN/ORC poll used for the debates) show Johnson pulling more votes from Clinton than Trump nationally.
a vote for johnson is a vote for clinton, because a libertarian is a republican that thinks he's too intelligent to be associated with dumb republicans.
a vote for stein is a vote for trump, because a green party voter is a democrat who thinks he's to pure to be associated with corrupt democrats.