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: Taken earlier during the White House state dinner on the occasion of the U.S.-Africa Leaders Summit.  Responser: Can you believe it? Dinner at the White House, the House built by AFRICAN SLAVES...I'M SOOOOO PROUD OF YOU, POTUS AND THE CBC
