Legend's wife, Chrissy Teigen, and their young children appeared on stage together briefly.
"I want to send a shoutout -- actually, can you come onstage, baby?" he asked. "I want you guys to see, my wife is here. My daughter, Luna, is here. My son, Miles, is here. We're teaching our young people early to participate in their democracy."
This was the first public appearance Teigen had made since the recent loss of their son, Jack.