I voted Cornel West for president earlier today (PSL was not on the ballot here). I've now voted for left-wing minor party/independent presidential candidates in all six of the presidential elections that I've voted in. Never had any regrets about any of those votes either.
By the way, this could be the first presidential election since 2008 where left-wing minor party and independent presidential candidates get more combined votes than the Libertarians. Will be interesting to see...