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, I joined the Congressional Progressive Caucus to once again demand action by Congress on gun violence! Enough is Enough!  Responser: Thank you. All these shootings -- they break my heart. Make it stop. Enough.
