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: At the North American Strategic Infrastructure Leadership Forum. Great crowd, great ideas.  Responser: Can we start a non-government park with VA Tax breaks like they did for RTP in NC in the 1959-60 timeframe. Use energy and education products themes as a base for the park.
