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 was the guest of Orange County Register Book Club last Thursday! Read all about it here: http://www.deankoontz.com/register-book-club-event/  Responser: The best reading I've ever read.
