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: Happy 64th Birthday to the United States Air Force! I was born on an USAF base while my Dad was serving our country.  Responser: I was born on Carlswell AFB. Though it is now Carlswell NAS.
