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 will be holding a TeleForum on Thur, Dec 15 at 7:15pm. I want to hear from you. Register now! http://bit.ly/sxi0p3  Responser: http://jezebel.com/5865791/woman-who-attacked-obamacare-apologizes-after-breast-cancer-diagnosis
