“Analysts say Sanders’s decision to attack Clinton more aggressively is understandable: It’s what candidates who are behind tend to do. But in Sanders’s case, he risks damaging his brand as an anti-establishment politician who has boasted about never running negative television ads and pledged to stay positive in his bid for the Democratic nomination..”
It’s what candidates do when they are running behind…. way behind.
Clinton aides say he is betraying his promise not to attack. They may have a point.