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: Sending my support to Wisconsin workers. Governor Walker goes too far -- we must not eliminate reasonable bargaining rights for public employees.  Responser: Lets ask Gillibrand how much campaign money she got from the unions here in New York for her re-run. The UNIONS have always paid off the DEM-O-RATS
