2024 election live updates: More than 19 million have voted early so far

The rally was held in Madison's Alliant Energy Center, which is able to hold more than 10,000 people. The event space was not completely filled -- only about two-thirds of the seats and floor space was taken.

Walz took aim at Trump and questioned his ally billionaire tech mogul Elon Musk, who Walz claimed was "the real running mate."

"So look, Elon's on that stage, jumping around, skipping like a dip*** on these things," Walz said to laughs.

"Seriously, where is Senator Vance, after he got asked the simplest question in the world at the debate, did Donald Trump lose the 2020 election? And after two weeks, he finally said, 'No, he didn't.' That's where he's been spending his time," Walz said.

Obama then came on stage and embraced Walz.

"Love that dude. Love that man. The kind of person who should be in politics," Obama said.

At three points during Obama's remarks at the Madison rally, which was billed as an event where the Democrats pushed early voting on the first day that in-person locations opened in Wisconsin, the former president utilized his old, famous saying: "Don't boo, vote!"

The crowd started to chant "Vote!" at the end of Obama's remarks.

"So whether this election is making you feel excited or scared or hopeful or frustrated or anything in between, do not sit back and hope for the best. Do not think this is a distraction or a joke. Get off your couch and do what? Vote," Obama said. "Put down your phones and do what? Vote. Vote for Kamala Harris as the next president of the United States. Vote for Tim Walz as the next vice president of the United States, vote for [incumbent Sen.] Tammy Baldwin and this whole incredible Wisconsin Democratic ticket."

Harris declined to discuss a possible pardon of Trump, who was convicted in May in a New York court of 34 criminal counts.

"I'm not going to get into those hypotheticals. I'm focused on the next 14 days," she told NBC's Hallie Jackson.

Asked if doing so could help the country move on, Harris said, "What's going to help us move on is I get elected president of the United States."

Harris was asked about President Joe Biden's mental state during an interview with NBC's Hallie Jackson on Tuesday.

Asked by Jackson whether she had seen "anything like what happened at the debate night behind closed doors," Harris did not answer directly.

"It was a bad debate. People have bad debates. He is absolutely..."

"Well, that's the reason why you're here and he's not running for the top of the ticket," Jackson responded.

"Well, you'd have to ask him if that's the only reason why," Harris said.

"What do you think?" Jackson asked.

"I am running for president of the United States, Joe Biden is not, and my presidency will be about bringing a new generation of leadership to America that is focused on the work that we need to do to invest in the ambitions and aspirations of the American people."

-ABC News'

President Joe Biden and Sen. Bernie Sanders teamed up Tuesday afternoon at an event in Concord, New Hampshire, to tout a new report showing Medicare enrollees saved nearly $1 billion on their prescription drugs so far in 2024 through the Inflation Reduction Act.

Biden warned that this progress could be undone if Trump wins in November.

"Trump and MAGA Republicans want to eliminate the Inflation Reduction Act, which we're talking about, the big bill which made all these savings possible, raising prescription drug prices again for millions of Americans," he said.

Biden said Trump and the GOP have tried to replace the Affordable Care Act 51 times and mocked the former president for having only a "concept of a plan."

Biden said if Harris isn't elected, Trump will "kick 45 million people off their health insurance," give tax breaks to the wealthiest Americans, get rid of the Department of Education and gut Social Security and Medicare.

"He'll hurt hard-working people," he said.