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: Lots of great people at #aipacpc2013 but pretty stoked to have just met Jeremy Garelick, writer of The Break-Up...a comedy fave of mine.  Responser: We're a big fan of yours too Eric. We look forward to working with you to strengthen the U.S.-Israel relationship... Jeremy Garelick and Samantha Rifkin Garelick
