People have been discussing this as a matter of protected classes, but I think this is better discussed as a matter of publicly protected acts and the conditions of a democratic society. The right to freely associate is one thing, but this issue insofar as it is intentionally aimed at retaliation for a publicly protected act, voting, feels more like a form of intimidation. I wonder whether there are (or should be) laws against voter intimidation which might apply? It is true that at the moment the single propane dealer has limited leverage because there are other dealers, but that is not essential to the situation. If it is the right of one propane dealer to do this, then it is the right of each and therefore all. And it shouldn't matter if Trumpkins, or more generally Republicans, are not a protected group, because this kind of behavior is problematic whether it is based on discrimination, per se, or whether it simply happens that the interests of the class of propane dealers align so that supporting a Democrat might be in the best interest of each. If they each therefore refuse to deal propane to those who will be voting against their interests, are they not leveraging their trade in a necessity into a form of intimidation? If any group of people who provide a basic service threatened to withdraw their service solely to those who voted a certain way (say physicians who hated Obamacare refused to serve Democrats) we'd have a crisis. So the hypothetical situation of no access to a necessity, e.g. propane, is still a real concern to the legitimacy of the dealer's business practices. It seems to strike at the heart of the basic civic respect that is necessary if a democratic system is going to work properly.