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: I wish it weren't real and yet I'm not surprised at all by Ben Slaves were immigrants, Does Ancestry.com know about this? http://www.huffingtonpost.com/entry/ben-carson-slaves-immigrants_us_58bdbf1fe4b033be1467634f?  Responser: No words to his ignorance. Unbelievable. Smh.
