Definition: Given a 'poster' sentence and a corresponding 'response' (often, from Facebook or Reddit)classify the sentiment of the given response into four categories: 1) Positive, 2) Negative, 3) Neutral, and 4) Mixed if it contains both positive and negative.
Input: Poster: The only question that matters in the GOP nomination fight right now: Can Trump be stopped? My latest.  Responser: How can you equate what Joe Biden said about guns in 2008 with Trump's veiled exhortation for gun owners to take out Hillary?
