Before an audience of about 1,700, many of them African American and Hispanic women, the moderator asked Sanders (I-Vt.) how he would handle the rise in white supremacy. Sanders spoke of fighting discrimination and running a campaign “to bring our people together around an agenda that speaks to all people” — then returned to a familiar message on universal health care.

For many in the audience, that was insufficient. “Come on!” a woman shouted from the back, as others began to jeer and boo.