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: #Pasadena bus system is now using TAP. This will make it easier for commuters to use public transit. Hop on and tap your card!  Responser: https://www.youtube.com/watch?v=M_Hh2hFuLpg... you bused in people as seat fillers and have no idea what they were supporting we have proof.
