How would you go about it?
It depends on the the purpose of the question. If it was genuinely a question aimed at gauging opinions on a real social problem, I would for starters not begin by generalizing the subject of the supposed problem as "blacks", because as I'm sure you're aware, even among people with the same skin color, many think very differently. And beyond that I would make sure to specify exactly what it is I'm asking, in a way that there can't be a debate about what the question is about. That's a very simple thing to do.
However as a poll taker, I would question how people, whether politicians or other voters, would be aware of the skin color of the people causing this rather unspecified problem.