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: ".@RepDonaldPayne: Thank you .@RepLanceNJ7 for co-leading letter for funding colorectal cancer research" I am proud to work with you.  Responser: Don't forget to call John Boehner's office, 202.225.0600 PASS THE UI BILL NOW. Vote all republican obstructionist OUT in November. SHAME ON THIS CONGRESS
