DNC 2024 Day 2: 'Yes, she can': Obama endorses Harris, blasts Trump

The lively ceremonial roll call has so far featured some surprise cameos alongside more expected political leaders from their respective states.

Standing along the Indiana delegates was actor Sean Astin of "The Goonies" fame, while Louisiana native Wendell Pierce, an actor known for "The Wire," joined his state's delegates as they cast their votes for Harris.

The crowd was also treated to a surprise appearance by Lil Jon when Georgia delegates cast their votes.

At Harris' rally in Milwaukee, the campaign announced in the arena that the vice president will be broadcast into the DNC and that they want the crowd here to "bring the energy."

"I'm really going to need this energy when they broadcast this live, right?" said Jaliah Jefferson, Wisconsin deputy organizing director, Milwaukee. "VP Harris will be beamed into TVs all across the country."

"So when it's our moment, we need to get loud and leave no doubt that Wisconsin is going to send Kamala Harris and Tim Walz to the White House," she added.

Crowds have been waiting for hours to enter the Fiserv Forum -- where the RNC was held last month. The arena is packed with people and it's a party vibe. The music has been pumping loudly, people are dancing and waving their light-up wristbands. The bass in the music is so loud the floor is vibrating.

The roll call for the DNC has begun.

State delegates will go in alphabetical order, with a DJ playing music related to each state.

Pennsylvania Gov. Josh Shapiro told ABC News Live Prime anchor Linsey Davis in an interview from the DNC that he is seeing "incredible enthusiasm" for the Harris-Walz campaign on the ground.

Pennsylvania Gov. Josh Shapiro told ABC News Live Prime anchor Linsey Davis in an interview from the DNC that he is seeing "incredible enthusiasm" for the Harris-Walz campaign on the ground.

"Kamala Harris is showing up in communities that are oftentimes ignored and left behind," Shapiro said, adding that she's sending a message to Pennsylvanians that she cares about them.

"I think as this race progresses, you're going to continue to see real momentum on her part," he said.