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: Congratulations to the 2011 National Champions! Roll Tide!  Responser: My husband and I ran into you with some friends at the first AL/LSU game....that didn't end so well, so nice to have the championship in Alabama once again!
