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: This is a very difficult and unusual fact pattern but it is difficult and unusual because of decisions made by Secretary Clinton.  Responser: https://m.facebook.com/story.php?story_fbid=10154083867077951&id=115777632950
