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

A poll from Marquette University Law School published Wednesday of voters in Wisconsin found that Vice President Kamala Harris and former President Donald Trump are closely matched among registered voters in a 2024 general election head-to-head matchup.

Among registered voters, Trump and Harris were split 50% to 49%, respectively, and among likely voters, they were split 49% to 50%, according to the poll.

The poll shows virtually no change from the split between President Joe Biden and Trump in a Marquette poll that was conducted in June.

When a few third-party candidates are added in, Harris and Trump are still about even among registered voters, with Harris netting 45%, Trump netting 43% and independent candidate Robert F. Kennedy Jr. getting 8%, the poll found.

The survey was conducted between July 24 to Aug. 1. It has a margin of error of +/- 4.6 percentage points among registered Wisconsin voters and +/- 4.8 percentage points among likely Wisconsin voters.

-ABC News' Oren Oppenheim

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