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: Retweeted Sanofi US (@SanofiUS): .@RepLanceNJ7 re: health policy trends & #rarediseases #ExLPRSummit http://t.co/haIIwYsnV1  Responser: I just wanted to thank you for voting No on HR 1599. even though it passed, 80% of Americans disagree with it. you represent the people and thats a great thing
