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: Since I hv used 30 as the number of terrorist plots in US since 9/11 I stand corrected by CongResearchService numbr 70. Sorry to Iowans  Responser: Now that you realize you're wrong, are you going to actually do something about it??? Highly doubtful.
