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: Senator Murkowski's e-newsletter for July 23, 2009  Responser: Purdue IN. nice, they have a lot of low cost heath related education there including Psycology
