As someone who lives outside America, the obvious answer to me is unless your product is directly related to politics, a company as an entity should have no public stance on politics.

From the outside looking in, American politics has long since ceased being about policy and idea's, it is now a contest of identity where it doesn't matter what someone stands for so long as they are on the team I support.

In this kind of climate, for a business or other entity to involve themselves in politics would be consciously choosing to more or less blacklist themselves from doing business with the other side or run the risk of having their brand tarnished via social media for whatever stance they take.

Finally, a business that takes a political stance does damage not just to themselves but to their employees as in the current political climate, both sides have no problems harassing a person or worse if they are viewed as not "on their team". Once a company takes a political stance, it doesn't matter if what that employee believes or does nor does it matter that said employee might be working for this company because they have a family to feed and don't have the luxury of quitting and looking for a new job, the very fact that they work for said company means that they should be treated as persona-non-grata.

Make it simple, a company can't vote, so a company doesn't have a political affiliation (unless of course, it is some kind of lobbying company etc).