While people should be free to comment in support of whichever candidate(s) they feel represent their interests best, I don't think limiting debate by those who may disagree is the right solution; it would only serve to make the instance more of an echo chamber.

Given that the average Threadiverse user is already politically to the left of the average, I don't think there's a significant risk of McCarthyists flooding discussions on here with anti-leftist rhetoric without being met with downvotes.