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 to attend the mail handlers conference today for Elizabeth Warren. In a few days, let's vote to send her to the Senate to fight for us!  Responser: Mike would rather you than her..still undecided...
