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: Thanks to Sierra Club of Hawaii for endorsing my Senate candidacy. I'll keep working to build HI's clean energy economy.  Responser: Aloha Brian! ....But not with toxic, dangerous geothermal & geothermal fracking... right? ( No on Syria, No on GMO/pesticides poisoning of Hawai'i!)
