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: Lots of calls happening at the Tulsa Headquarters right now reminding supporters to vote Tuesday! This morning #TeamLankford had a great group from the Tulsa HQ meeting Oklahomans door to door and two guys from the OKC HQ grabbed a photo with the Governor.  Responser: Great picture of my son with Governor Fallin. One proud mom.
