Kim is the third Democratic Senate candidate to address the DNC, after Angela Alsobrooks and Lisa Blunt Rochester. All three are running in safely Democratic states. By contrast, vulnerable Democratic senators like Tammy Baldwin of Wisconsin and Jacky Rosen of Nevada are staying away.

—538’s Nathaniel Rakich

Stevie Wonder performed "Higher Ground" for the DNC crowd.

"This year I prayed very hard for peace to come to our world's nations, but also to each one of our hearts," he said in remarks before his performance.

"Even though our hearts have been beaten and broken beyond prayer, I know the important action and now is the time to understand where we are and what it will take to win. Win the broken hearts. Win the disenchanted," he said. "Now is the time."

New Jersey Rep. Andy Kim, who just spoke, was captured in a viral photo kneeling to clean up litter-lined floors of the U.S. Capitol after the insurrection.

"What I learned on January 6 is that all of us, all of our, are caretakers for our great republic," Kim told the crowd.

The video showing scenes from the Jan. 6 attack sparked chants of "lock him up," which only subsided once Thompson took the stage.

The crowd has gotten very animated whenever the riot is brought up, often chanting for Trump's imprisonment.

-ABC News' Tal Axelrod