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: Some Republicans are underestimating Hillary Clinton at this point in the campaign. Here's my take.  Responser: "And Republicans are in denial about it." You said it all there. Ha!
