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: wrote President Obama offering options to help bridge the gap between Reps and Dems on health care reform. Here's the letter: http://bit.ly/dhpwl  Responser: Can we turn this into a petition and have all your constituents sign and then submit to the president?
