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 thoughts on How to Get Congress on Good Behavior - @TheAtlantic http://bit.ly/OmWeeA  Responser: Don't let Diane Black take credit for your ideas.
