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: If you're interested in attending the President's Inauguration on January 21, I've been given a limited number of tickets to distribute. Recipients will be chosen by lottery. I've set up a form on my website if you'd like to put your name in.  Responser: So sad. I'll be in Australia on the Inauguration day. Great to have you as senator.
