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: Legislation to Eliminate Lead in Drinking Water Passes Committee  Responser: OMG I thought this was taken care of in 1910. It certainly should have been.
