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: Happy 4th of July! I'm looking forward to our family tradition of reading the Declaration of Independence, which always sparks a great discussion about the history of our country: http://goo.gl/TB1n.  Responser: You should be sure to read the Constitution as well. Have a great Independence Day.
