Harris shared a video on social media of a phone call between her and Walz earlier Wednesday ahead of his DNC speech and told him to “enjoy the moment.”

“You’re gonna be fantastic tonight,” Harris told Walz.

“I’m ready," he said.

-ABC News' Fritz Farrow

He touted his own background, rattling through his experience in the Army National Guard and as a high school teacher.

"It was those players and my students who inspired me to run for Congress. They saw in me what I hoped to instill in them: a commitment to the common good," he said.

He also promoted his policy accomplishments, garnering particularly loud applause for his policy providing free breakfast and lunch in Minnesota public schools.

Walz said that while Republicans were banning books in schools, "we were banishing hunger in ours."

And then, he served the duty of a loyal No. 2 -- boosting his boss.

"If you're a middle class family or a family trying to get into the middle class, Kamala Harris is going to cut your taxes," he said. "If you're hoping to buy a home, Kamala Harris is going to help make it more affordable."

And then, in true "Friday Night Lights" fashion, he issued a call to action with a football metaphor.

"We're down a field goal, but we're on offense and we've got the ball," he said before touting Harris as the team leader. "We're driving down the field, and boy, do we have the right team."

As Walz gave his acceptance speech, his son Gus was spotted in tears listening to his father speak. His daughter Hope was seen holding up a heart to him.

The Walz family joined him on stage after he wrapped up his remarks.

"We got 76 days. That's nothing. There'll be time to sleep when you're dead," he said to cheers. "We’re gonna leave it all on the field. That’s how we’ll keep moving forward."