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: Why is do people expect the coast guard to stop oil spill. They stop drugs not oil Drugs r in powder form nice and dry  Responser: We can send a man to the moon..
