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: Green Party high-speed rail plan would create jobs, reduce congestion & cut greenhouse gas emissions! Check out the correct link! http://www.youtube.com/watch?v=-Ckm-otj7UUU  Responser: NL needs a high-speed rail system. We have the energy to drive it!!http://www.facebook.com/group.php?gid=348310271173&ref=ts
