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: The numbers from the 2015 health care insurance open enrollment period are in: more than 25,000 Delawareans signed up for health insurance this year. This is a 74% increase over 2014, yet another sign the Affordable Care Act is working!  Responser: Amazing how well it works when you force people to sign up
