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: My deepest condolences go out to the families and friends of the victims of this morning's tragic shooting at the Washington, D.C. Navy Yard. My thoughts are with you.  Responser: Prayers are nice, let's see some legislation that will stop these events from happening ever again.
