Funny things happen in a democracy.
Like how for example, that sort of thing wouldn't wash without the support of the majority.
I think it's safe to say that in this day and age, the majority white Americans don't think it's cool to marginalize black Americans. This is a huge cultural shift from days past when it *was* okay, and even expected. It's also pretty much standard these days to think that it's not cool to do that to people of other races either.
In America's past, I would say that this was a very real danger, and in fact it has happened. These days, even suggesting something like that is a great way for a politician to lose her job. Actually changing those words into action is even more impossible. Nevermind there being certain laws against it.