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: Facing the debt: Alarm over U.S. debt creates 'window' for tough choices http://ht.ly/3gNPC  Responser: I was a a meeting where I heard Lynn say she would protect Medicare and Social Security. Is this the beginning of the back-pedal?
