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: Dean is taking YOUR questions! RSVP for his live global online video chat this Thursday, 1/29 at 2PM ET, sponsored by USA TODAY. You can even post a question for Dean in advance! http://usat.ly/1AV9H2a  Responser: Dean Jones Got a lot on your plate, Dean.
