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: A big thank you to all the first responders & emergency officials who have been doing an outstanding job responding to the I-5 bridge collapse.  Responser: I wish you were our Congressperson!
