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: It's been a very productive morning here in #Columbus. The Directors Town Hall meeting enabled veterans to express their opinions about services they need from the VA #MS01  Responser: http://dailycaller.com/2016/07/21/poll-troops-prefer-gary-johnson-over-trump-clinton/
