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: Arpaio's friends are abandoning him -- but we need to keep the pressure on. Sign our petition demanding Arpaio be held responsible for hiring a private investigator to dig for dirt on a federal judge's wife: http://goo.gl/Fkb6sd  Responser: Should have been fired a long time ago. We all knew he was dirty. Now let him pay for his actions. Pink is a pretty color for him. .
