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: Some of the people who dropped everything to join the marchers on Bloody Sunday were as young as 12 years old.  Responser: R u still slurping and swallowing your daddy obamas DNA
