The former first lady warned that "we can not be our worst enemies" and not take things for granted in this election.

"We cannot get a Goldilocks complex about whether everything is just right," Michelle Obama said to cheers.

"We cannot indulge our anxieties about whether this country will elect someone like Kamala instead of doing everything we can to get someone like Kamala elected," she added.

Obama said she is confident that Harris would be a great leader but noted that there will be a lot of opponents who will put out lies about her.

"It’s up to us to remember what Kamala’s mother told her: Don’t just sit around and complain, do something," she said. "So if they lie about her, and they will, we’ve got to do something."

The former first lady took several subtle and clear jabs at former President Donald Trump, contrasting his past scandals with Harris' years of accomplishments.

"She understands that most of us will never be afforded the grace of failing forward we will never benefit from the affirmative action of generational wealth," she said.

"If we bankrupt a business or choke in a crisis, we don’t get a second, third, or fourth chance," she added.

Michelle Obama got more direct and noted that Trump "did everything in his power to try to make people fear us."

"His limited and narrow view of the world made him feel threatened by the existence of two hardworking, highly educated, successful people who also happened to be Black," she said.

"Who’s going to tell him that the job he’s currently seeking might just be one of those 'Black jobs?'" Obama asked to a cheering crowd.

"It’s his same old con: doubling down on ugly, misogynistic, racist lies as a substitute for real ideas and solutions that will actually make people’s lives better," she added.

Emhoff sent the crowd into a tizzy after attendees had been lagging in energy.

The first gentleman told a story of his first date with Harris, prompting cheers when describing by an awkward voicemail he sent her.

-ABC News' Tal Axelrod

Michelle Obama reflected on her mother's memory and the values that she instilled in her from an early age.

"Kamala Harris and I built our lives on those same foundational values. Even though our mothers grew up an ocean apart, they shared the same belief in the promise of this country," she said.

Obama continued to tout Harris' skills, experience and temperament during her years of service.

"Kamala Harris is more than ready for this moment," she said. "She is one of the most qualified people ever to seek the office of the presidency."