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: Thrilled to have so many St. Louis University High School boys stop by my D.C. office today! As our country's future leaders, it's always great to visit with them and learn about their concerns.  Responser: Sara Buehring-I see someone you may know!!
