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: Congrats to the Portland Thorns on their National Women's Soccer League championship win! #BAON  Responser: Bombs are not the answer- They cause birth defects for generations- http://www.huffingtonpost.com/2013/03/20/iraq-war-anniversary-birth-defects-cancer_n_2917701.html
