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 debate grades: Clinton A, Sanders B, O'Malley C+, Chafee D+, Webb D. See the full report cards here.  Responser: I think there was grade inflation.
