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 thoughts are with the Umpqua Community College victims & families. It's time for our nation to come together to prevent these tragedies.  Responser: It's time to get the politicians out of the pockets of the NRA.
