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.
Through the ceremonial roll call, showcasing delegates from all corners of the U.S., the Democratic party is "making it clear they are the party that represents the country," White House correspondent MaryAlice Parks told ABC News Live Prime anchor Linsey Davis.
"They are trying to make it clear that they are building a multi-generational, multi-racial coalition," she said.
Delegates are partying on the convention floor, with hot songs from artists from each state blaring as delegates are cast for Harris.
-ABC News' Tal Axelrod
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.
-ABC News' Ben Stein
