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: 1 in 6 New Mexico residents receive Social Security. On its 78th anniversary, Tom renews the call to protect Social Security.  Responser: Another lifetime politician, time to let someone else represent us. Funny what people promise during re-election. Why didn't they do these things their first term?
