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: My segment with Lou Dobbs discussing national security leaks.  Responser: http://www.latimes.com/entertainment/tv/showtracker/la-et-st-mayor-michael-bloomberg-police-strike-gun-control-20120724,0,6820833.story
