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: Conflicting day for me yesterday- Happy to see Americans Sloane and Jamie do well, sad to see Venus and James out... the circle of life! I must say, James Blake is such a gentleman with humility and depth- will miss watching him and gasping at those incredible gets. The best to him!  Responser: Watching the replay of his match. In the tiebreakers James got reckless perhaps with too much desire to win the points.
