At this point, companies might as well just have an explicit policy of not hiring anyone registered as a Republican. Party affiliation is not a protected class, after all.
I wouldn't surprised if I get downvoted for this, but I intend to ask anyone I interview in the future (not currently in a role that involves hiring) if they voted for Trump in 2020. And a yes will be a disqualifying answer on the basis of poor judgement. (It's also a question I will be asking any potential employer I interview with, going forward, for the same reason.)
Yes, I will lose some diversity of thought as a result. Yes it means I can't hire employees in California. Yes, there will be potential bad PR. No, I won't feel guilty about it at all. And yes, I will also run it by appropriate lawyers before actually implementing it.