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: Today marks the 68th anniversary of D-Day, a day where thousands of Americans and Montanans answered a historic call to duty and began the liberation of a continent.  Responser: And a great many people have no clue what the D stands for.
