Walz introduced himself to the country and touted his accomplishments.
The third night of the Democratic National Convention continued the themes of joy and freedom.
A who's who of speakers, including a surprise speech from Oprah Winfrey, headlined the night aimed to showcase vice presidential nominee Minnesota Gov. Tim Walz.
"Coach Walz" brought his energy to the crowd touting his and Vice President Kamala Harris' vision for the future of the country.
At the end of fired-up remarks, Oprah told the crowd: "Let us choose truth, let us choose honor and let us choose joy!"
"Because that's the best of America. But more than anything else, let us choose freedom. Why? Because that's the best of America. We're all Americans. And together, let's all choose Kamala Harris."
Oprah gave tribute to Tessie Prevost Williams, who died earlier this year. Williams was one of four Black girls who helped integrate New Orleans public schools in 1960.
She then tied Williams to Harris, saying Williams "paved the way for another young girl who, nine years later, became part of the second class to integrate the public schools in Berkeley, California.
"Harris famously reflected on her experience as a child being bused to school each day. During a spar with President Biden on the debate stage on busing, Harris told him: "That little girl was me."
Oprah has not mentioned Trump by name, but appeared to reference the former president and his running mate JD Vance.
"America is an ongoing project," she said.
"It requires commitment. It requires being open to the hard work and the hard work of democracy, and every now and then, it requires standing up to life's bullies."
She then brought up Vance's "childless cat lady" comments to cheers.
"Despite what some would have you think we are not so different from our neighbors," she said. "When a house is on fire, we don't ask about a homeowner's race or religion. We don't wonder who their partner is or how they voted. No, we just try to do the best we can to save them. And if the place happens to belong to a childless cat lady, well, we try to get that cat out too."
"What we're going to do is elect Kamala Harris as the next president of the United States," she said after taking the stage.
The first time Oprah put her legacy brand behind a political candidate was Barack Obama in 2008.
"That was some epic fire," she said of the Obamas speeches last night, taking inspiration from Michelle Obama's call on the crowd to "do something!"
