Harris posted a photo of her watching the second gentleman's speech at the DNC Tuesday night.

"Love you, Dougie," she wrote on the social media post.

After more than 30 minutes on stage, Obama had a simple message for convention-goers.

"As much as any policy or program, I believe that’s what we yearn for, a return to an America where we work together and look out for each other," Obama said.

"That is what this election is about," he added. "And I believe that’s why, if we each do our part over the next 77 days, if we knock on doors, if we make phone calls, if we talk to our friends, if we listen to our neighbors, if we work like we’ve never worked before, if we hold firm to our convictions, we will elect Kamala Harris as the next president of the United States and Tim Walz as the next vice president of the United States."

"So let’s get to work. God bless you, and God Bless the United States of America."

Turning personal, Obama spoke about the bond he had with Michelle Obama's mother, who passed away earlier this year.

"One of the reasons Marian and I became so close was she reminded me of my grandmother, the woman who helped raise me as a child," he said.

"They were strong, smart, resourceful women, full of common sense who, regardless of the barriers they encountered ... In that sense, they both represented an entire generation of working people who, through war and depression, discrimination and limited opportunity, helped build this country," he said.

Obama said to build a true Democratic majority, they have to give grace to people who may not align with their political views.

"That sense of mutual respect has to be part of our message," he said. "Our politics have become so polarized these days that all of us across the political spectrum seem so quick to assume the worst in others unless they agree with us on every single issue."

"We start thinking that the only way to win is to scold and shame and out-yell the other side. And after a while, regular folks just tune out or they don’t bother to vote," he continued. "Now that approach may work for the politicians who just want attention and thrive on division, but it won’t work for us to make progress on the things we care about, the things that really affect people’s lives."

Obama later acknowledged those ideas "can feel pretty naive right now" but was adamant "the ties that bind us are still there."

"Now the torch as been passed," Obama said, turning to Harris' candidacy and her campaign against former President Donald Trump.

"Now it is up to all of us to fight for the America we believe in," he added. "And make no mistake, it will be a fight."

Obama went on to slam Trump as a "78-year-old billionaire who has not stopped whining about his problems since he rose down his golden escalator."

"As we gather here tonight, the people who will decide this election are asking a very simple question: Who will fight for me? Who’s thinking about my future, about my children’s future, about our future together?" he asked. "One thing is for certain, Donald Trump is not losing sleep over that question."