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: House passed 1 month extension of National Flood Insurance Program, but a permanent solution is needed to protect families and property.  Responser: http://www.water.rutgers.edu/Stormwater_Management/rainbarrels.html
