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: This morning, I voted NO on #TPA because we need trade that makes the American economy work for working people #NoFastTrack #TPP  Responser: Thank you for always looking out for those of us who live here in Oregon.
