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: Tom sits down with Defense Secretary nominee Chuck Hagel to discuss national defense and learns he served at Fort Bliss and White Sands Missile Range.  Responser: Senator Udall represents us well.
