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 we pause and mourn Amb. Chris Stevens and the 3 other Americans lost in yesterday's senseless attacks. May their families find peace in these trying times.  Responser: And may our politics also be inspired by his example and that of the rest of the professional diplomatic corps.
