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: "My fundamental message won't change: We need a new generation of leaders in Congress....I've seen that I can make a difference in Washington," wrote Moulton. "It's hard, it's often frustrating, and it takes a great team and an awful lot of hard work."  Responser: You have our vote. And you have our thanks!
