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: USC beats Penn State in Rose Bowl in one of the craziest games you'll ever see  Responser: Actually, Penn State beat themselves with two 15-yard penalties in a row toward the end of the game. I think that's what did them in.
