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: I'm joining the great Tavis Smiley on his PBS program Friday for The Seventh Sense. Tune in: http://www.pbs.org/wnet/tavissmiley/interviews/author-joshua-cooper-ramo/  Responser: Such a good guy & good program!
