Obama praised President Biden and offered support for Harris.
Vice President Kamala Harris officially became the official Democratic presidential nominee during the second night of the Democratic National Convention.
The night included a lively and upbeat roll call vote of delegates that featured a DJ, some celebrities and energetic speeches. Also, Harris, who campaigned in Milwaukee, thanked the crowd in a live-streamed message.
Second gentleman Doug Emoff talked about his long relationship with Harris and touted her vision for the country.
But the night's biggest headline was the return of former President Barack Obama and first lady Michelle Obama to the DNC stage. Both stressed what's at stake in this election and pushed Americans to come together to bring the country to a better future.
There are more than 15,000 people at the Harris rally in Milwaukee, which will broadcast into the DNC tonight, according to her campaign.
The crowd was going wild during Gov. Tim Walz's remarks.
People are holding signs that say "Freedom" and some have brought their own handmade signs, including one that says "Choose joy."
-ABC News' Selina Wang
A large group of pro-Palestinian protesters marched outside the Israeli Consulate in Chicago as the DNC roll call took place.
The exteriors were covered with barricades and several police officers were on hand.
There were no reports of arrests as of 8:45 p.m. ET.
Protesters march outside Israeli consulate in Chicago
-ABC News' Ben Stein
The lively ceremonial roll call has so far featured some surprise cameos alongside more expected political leaders from their respective states.
Standing among the Indiana delegates was actor Sean Astin of "The Goonies" and "Rudy" fame, while Louisiana native Wendell Pierce, an actor known for "The Wire," joined his state's delegates as they cast their votes for Harris.
New York saw director Spike Lee alongside political leaders from the state, while Texas saw actress Eva Longoria of "Desperate Housewives" fame.
The crowd was also treated to a surprise performance by Lil Jon when Georgia delegates cast their votes.
A cameo-filled ceremonial roll call at the DNC
The crowd at the United Center was treated to a surprise appearance by Lil Jon when Georgia delegates cast their votes for Kamala Harris.
The rapper sang "Turn Down for What" to a roaring crowd, adding extra lines that repeated the theme: "We're not going back."
