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: With the first two states at risk, Hillary Clinton sharpens attack against Bernie Sanders. Will she regain momentum? Our political panel debates what's Happening Now!  Responser: maybe folks are starting to realize she is a liar, liar, liar and 7 years of another liar is enough
