Saturday morning during two votes of the convention....called by the party’s chairwoman, Roberta Lange... After the votes, Sanders supporters flooded the space in front of the stage where party officials sat, some of them hurling a host of epithets specifically at Lange and the party's vice chairman, Chris Wicker. ... The following day, some Sanders supporters staged a protest outside of the state party’s offices where they wrote on the building, “you are scum” and “fire Roberta.” Lange’s cellphone number and other personal contact information were subsequently leaked online, and state party officials say she has received thousands of death...