Andrew Breitbart dies at 43 – and Twitter expresses shock and sadness

Andrew Breitbart, the Conservative internet publisher and activist, has died at the age of 43. A statement published on his Breitbart.com site said he "passed away unexpectedly of natural causes" shortly after midnight in Los Angeles. He is survived by his wife, Susannah Bean Breitbart, 41, and four children. His death prompted a wave of reaction on Twitter and elsewhere in the media. [ View the story "Andrew Breitbart (1969-2012)" on Storify ]