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: Sen. Merkley is at the WH discussing the need to advance pay equity for women with Vice President Biden and the Middle Class Task Force  Responser: Thank you for being the mover & shaker that we really need!
