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: I'm honored to have Marjorie, a former foster youth, interning in my D.C. office. Watch this piece by WUSA that highlights her inspirational story.  Responser: I'm so excited to see the success of the FYI class of 2011. The opportunity is one in a lifetime
