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: What a way to start Democrat Day at the Illinois State Fair: cheering on Senator Tim Kaine as he accompanies Mamas Wranglers on his harmonica.  Responser: http://watchdog.org/100665/durbins-enemies-list-is-finger-licking-bad/
