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: Just cosponsored H.R. 548, Restoring Democracy in the Workplace Act, a union bill combating Big Labor.  Responser: A bill consisting of a single sentence. Very well done, sir.
