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: #tbt Rachel & I think fondly of our time at the Reagan Ranch and hope to go back soon with the kids! Happy birthday, Mr. President  Responser: Got your hat on the rack and ready to go!
