As Doug Emhoff walked up to the lectern to introduce his wife, Harris staffers shouted his name over and over - that of a man who made history as America’s first male vice-presidential spouse, and who could do so again in November if Harris were to win the presidency. The chant began at Vice President Harris’s campaign headquarters in Wilmington, Del., on Monday as she prepared to kick off her campaign for the Democratic presidential nomination. After almost four years of upending centuries-old gender stereotypes, Emhoff told the enthusiastic crowd he was ready for the next challenge: “Now I get...