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: I'm so proud of our brave law enforcement officers and national guard. We owe a great debt to them today and every day.  Responser: carpet bagging troll...Liz Warren does not represent Massachusetts
