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 Judiciary Committee is resuming the mark up of #SOPA next Wednesday (12/21). Stay tuned!  Responser: Please keep fighting, Zoe. Proud to have you representing us. My youngest daughter Zoe thanks you!
