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 time tomorrow my #AZ office will be filled w/Service Academy Applicants interviewing w/#AZ06's best panelists.  Responser: Pick a few good ones for the USMMA.
