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: Today is Medicare's 47th Anniversary. Let's tell Congress to commit to many more anniversaries to come #AZ09 #ProtectSeniors  Responser: alan rockman is an ass and a liar.
