Mexican congressional candidate shot dead while posing for a selfie

MIAMI -- Politicians are being targeted in Mexico ahead of the country's July elections, and the latest murder was caught on surveillance video.The footage shows Mexican congressional candidate Fernando Puron posing for a selfie with a supporter after a campaign debate last Friday, when a man walks up from behind, raises a gun and fires at the back of his head.Puron was running on an anti-cartel platform which made him a target in Piedras Negras, which borders Texas.He is now one of 113 candidat