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: #CharlieTakesDC loves his morning drive to the hardware store! #DIY #adogandatruck  Responser: Is this legal without Congressional approval? http://nation.foxnews.com/2014/03/15/obama-relinquishes-us-control-internet
