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: China steals US secrets thru economic espionage in cyberspace Read opinion page WSJournal Jan27 china gets competitive thru US research  Responser: This sort of bigotry goes over big with the Tea Baggers.
