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: Today I'm fasting for comprehensive immigration reform in support of Fast for Families: A Call for Immigration Reform & Citizenship.  Responser: Good for You Congresswomen...Your Neighbor US Illinois Congressman Luis V. Gutierrez!
