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: John Heilemann and I will be watching #SOTU closely tonight...  Responser: http://twitchy.com/2015/05/10/watch-mark-halperins-ghastly-cuban-authenticity-interrogation-of-ted-cruz-video/
