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: An in House Ag Comm. Hearing examining the MF Global Bankruptcy. Jon Corzine is going to testify. Will we find out? Where's the money?  Responser: The American people demand to know.
