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: 8 days later and still no progress on #StoppingTheShutdown. Want to stop the games from the Tea Party and get government running again? Add your name to our petition now! http://bit.ly/1e6l91w  Responser: "If it turns out that President Obama can make a deal with the most intransigent Mullahs in the world, but not the Republican Party, maybe, just maybe, he's not the problem." Jon Stewart
