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: In Pittsbugh! Join me at the Heinz Center this eve to raise $ for the Navy SEAL Foundation! Info: Navysealfoundation.org  Responser: Did Kerry find out something about Benghazi? His wife owns Heinz?
