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: America's "all of the above" renewable and traditional energy sources can get us less dependent on foreign oil, we just have to be given the chance. I told the Senate today that we're not running out of energy, we're running out of excuses.  Responser: The sun may not all the time, but the wind is sure to blow.
