Election 2024 updates: Trump campaign claims it was hacked by 'foreign sources'

Gov. Tim Walz visited the campaign's Wilmington headquarters Wednesday morning to a cheering crowd.

"I wanted to say thank you myself to the people who have put everything into helping us win. Holy smokes, this team," he said in a post on X.

Several volunteers and staffers were outside holding signs and shook the governor's hand as he greeted them, according to a video of the visit on his X account.

The crowd engaged in a chant of "Let's go coach," referencing Walz's time as a high school football coach.

"It's Friday night lights," Walz responded.

-ABC News' Will McDuffie, Gabriella Abdul-Hakim Isabella Murray and Fritz Farrow

The Harris-Walz campaign issued a memo on Wednesday touting its ground game in battleground states, specifically Wisconsin, Michigan and Pennsylvania.

The memo boasted of a "formidable door-knocking operation" in Wisconsin with more than 160 full-time coordinated staffers on the ground, an "explosion of volunteer interest" in Michigan, with more than 9,000 new volunteer sign-ups, and "unprecedented enthusiasm" in Pennsylvania, citing Tuesday's rally in Philadelphia that the campaign claims brought in more than 14,000 people.

The campaign said it has more than 600 coordinated staff members on the ground in those three states and plans to add 150 more in the first two weeks of August.

-ABC News' Will McDuffie, Gabriella Abdul-Hakim and Fritz Farrow

In the first 24 hours since Vice President Kamala Harris announced Minnesota Gov. Tim Walz as her running mate, the Harris-Walz campaign has raised $36 million, according to a campaign official.

-ABC News' Gabriella Abdul-Hakim

Twenty-two Democratic governors are lauding the fact that their colleague, Minnesota Gov. Tim Walz, has joined the 2024 Democratic ticket.

In a statement released on Wednesday, they stressed as a group of leaders -- which includes some they said were "elected in very challenging races in battleground and red states" -- that they were "thrilled" with Harris' selection.

The joint statement was notably signed by Pennsylvania Gov. Josh Shapiro, Kentucky Gov. Andy Beshear and Illinois Gov. JB Pritzker, who themselves were on the shortlist of potential Harris vice presidential picks. All three had submitted materials to the Democratic nominee's vetting team, though only Shapiro had traveled to Washington, D.C., on Sunday for an in-person interview with Harris.

"As America’s Democratic governors, we represent a broad and diverse set of 23 states that make up more than half the U.S. population. Many of us were elected in very challenging races in battleground and red states. We make tough decisions as state executives every day, and know what it takes to win. We couldn't be more thrilled that Vice President Kamala Harris has selected Governor Tim Walz as her running mate, and will do everything in our power to ensure their success this November," the statement, first shared with ABC News, reads.

"Overall, there’s no doubt the Harris-Walz ticket is the perfect one-two punch to knock out the GOP's dangerous agenda and failure to deliver for the American people," the statement continues.

Other governors who signed on to the letter include California's Gavin Newsom, Michigan's Gretchen Whitmer, Colorado's Jared Polis, Maryland's Wes Moore and North Carolina's Roy Cooper.