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: I'm urging the DOJ to investigate murder of #Trayvon Martin as hate crime: http://1.usa.gov/GS2klQ  Responser: Bob, the Admiral they were questioning didn't seem to think he was kidding! I saw the questioning somewhere, C-Span or somewhere, and did not think he was kidding either.
