It was the latest and possibly biggest tremor in a political earthquake consuming the Democratic party. He is provoking a kind of earthquake, raising lots of unsettling questions within the Democratic party - its direction, its leadership, its policy priorities, its beholdenness to big donors.” The rise of groups such as the Democratic Socialists of America (DSA) has occurred in tandem with a crisis of confidence and identity within the centrist wing of the Democratic party. “That isn’t the historic Democratic party. It’s a different ideology, it’s a different party. “