In terms of practical politics, Alaska is a safe state for Trump, so progressives should feel free to vote for the candidate they agree with the most. That could be Stein (Green), Johnson (Libertarian) or Clinton. I think it's safe to say almost none will vote for Trump. Let's hope they also vote in "down ballot" races.

Since we have a goofy winner-take-all system, the voters in the swing states determine who wins. In those states, Trump supporters are thrilled when they hear Bernie supporters say they will never vote for anyone else. This could be enough to tip some swing states and thus the whole enchillada to Trump