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: .@SeattleTimes: Cantwell right to fight weakening of media-ownership rules, would undermine indy local journalism http://bit.ly/vypFCs  Responser: GO Ms. Cantwell! Fight the good fight, as you often do.
