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: On MLK weekend, where service and civility are celebrated, I stand with @repjohnlewis, an American icon and continuing reminder of the power of #civility.  Responser: Rep. Cleaver. Please show your support for Rep. John Lewis and do not attend the inauguration ceremony on the 20th.
