**SNIP** Although none of the Democratic candidates explicitly rebuked Mr Obama's comments, Mr Sanders mounted the strongest defence of his policy platform. Answering questions on a forum aired by Univision , a Spanish-language TV network, he was asked whether Mr Obama was "right" to say voters didn't want systemic change. Mr Sanders, who describes himself as a democratic socialist and progressive, laughed and said: "Well, it depends on what you mean by tear down the system." "The agenda that we have is an agenda supported by the vast majority of working people," he said. "When I talk about raising the...