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: Sorry that I'm way behind on my vote explanations. Been busy trying to stop #NSA from collecting your data in violation of the Fourth Amendment. Don't worryI'll catch up soon.  Responser: And this is why you are my political hero. Thank you!
