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Honestly, the only people I have personally ever heard use the N-word in my life were Democrats.
I have heard people of every political leaning use it. Every religious devotion use it. And every race, and ethnicity use it. Whether people approve of it, or not. Whether they like it, or not; the fact of the matter is that it is common vernacular for describing negros. Given it's prevalence, and commonality of use; the only thing surprising, is the faux outrage people engage in when they hear someone else use the term.