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: "We're counting on you to take risks, to dream big dreams and not let those naysayers rob you of your aspirations. We're counting on you to embody the Wisconsin Idea and use your knowledge for the common good." #TBT  Responser: https://www.govtrack.us/congress/bills/113/s2639
