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: Statement on the Death of Bin Laden: http://bit.ly/iSrD3c  Responser: We can be so proud of the Navy Seals that did a great job in getting Bin Laden. I'm very proud of them for getting him, with boots on the ground ,and not with a missle.
