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: Rep. Eshoo Elected as Top Democrat of Telecommunications Subcommittee  Responser: Congratulations Anna! http://scottfisher.multiply.com/photos/album/45/Edward_Teller_Father_of_the_Hydrogen_Bomb
