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: A touching column by George Will about his son, Jon, who has Down syndrome and will turn 40 years old tomorrow:  Responser: No one is a throw away....each life is given to enhance the rest of us.
