U.S. Vice President Kamala Harris smiles as she speaks at her Presidential Campaign headquarters in Wilmington, DE, U.S., July 22, 2024. / Erin Schaff/Pool via REUTERS

Vice President Kamala Harris took a marginal lead over Republican Donald Trump in the U.S. presidential race, a new Reuters/Ipsos poll found. She arrived on July 23 in Wisconsin, a political battleground state, for her first campaign trip as the Democratic candidate.

Harris led Trump 44 percent to 42 percent among registered voters in the national poll, conducted on Monday and Tuesday after President Joe Biden dropped out of the contest on Sunday and endorsed Harris as his successor.

Previous surveys taken before Biden's exit found Harris and Trump tied at 44 percent a week ago and Trump ahead of her by a percentage point at the beginning of the month.

In all three cases, the difference was within the poll's 3-point margin of error, but the results could signal some limited momentum in Democrats' direction - and also suggest Trump may not have gotten the typical bump for a candidate following his party's national convention last week in Milwaukee.

Harris swiftly consolidated her party's support after Biden, 81, abandoned his reelection campaign under pressure from members of his party who worried about his ability to beat Trump or to serve for another four-year term.

She wrapped up the nomination on July 23 night by winning pledges from a majority of the delegates who at next month's party convention will determine the nominee, the campaign said.

Most Democratic lawmakers have lined up behind her candidacy, including the party's leaders in the Senate and House, Chuck Schumer and Hakeem Jeffries, who endorsed Harris on July 23 at a joint press conference.

An unofficial survey of delegates by the Associated Press showed Harris with more than 2,500 delegates, well over the 1,976 needed for the nomination. Delegates could still change their minds, but no one else received any votes in the AP survey; 54 delegates said they were undecided.

Harris' rise dramatically reshapes an election in which many voters were unhappy with their options.

Saddled with concerns that included his health and persistent high prices crimping Americans' household finances, Biden had been losing ground against Trump in opinion polls, particularly in the competitive states that are likely to decide the election, including Wisconsin and the Sun Belt states of Arizona and Nevada.

CAMPAIGN RESET

The Wisconsin event offers another opportunity for Harris, the first Black woman and Asian American to serve as vice president, to reset the Democrats' campaign.

Harris, 59, previewed how she plans to attack Trump on July 22, referring to her past roles pursuing "predators" and "fraudsters" as San Francisco district attorney and California attorney general.

"So hear me when I say: I know Donald Trump's type," she said of her rival, who has a felony conviction and was found liable for sexual assault in civil court.

Harris has been raking in campaign contributions. Her campaign said on july 22 she had raised $100 million since Sunday, topping the $95 million that the Biden campaign had in the bank at the end of June.

While a wave of senior Democrats have lined up behind Harris, the racial justice group Black Lives Matter on July 23 challenged the party's swift move. It called for a national virtual snap primary ahead of the Aug. 19-22 Democratic National Convention in Chicago, where the party will formally nominate its candidate.

"We call for the Rules Committee to create a process that allows for public participation in the nomination process, not just a nomination by party delegates," Black Lives Matter said in a statement to Reuters.

RUST BELT PUSH

Biden said on X that he would deliver a speech on July 24 night from the Oval Office explaining his decision to end his campaign. He was returning to Washington on Tuesday after spending several days in isolation at home with COVID-19. The president has tested negative and no longer has symptoms, the White House doctor said in a letter on Tuesday.

Biden's dramatic exit followed Trump's narrow survival of a July 13 assassination attempt that raised questions about security failures in the U.S. Secret Service. The agency director, Kimberly Cheatle, resigned on July 23 after numerous lawmakers called for her to step down.

Trump and his allies have tried to tether Harris to some of Biden's more unpopular policies, including his administration's handling of the surge of migrants at the southern border with Mexico.

"Kamala Harris' dismal record is one of complete failure and utter incompetence. Her policies are Biden's policies, and vice versa," Trump spokesperson Steven Cheung said.

Wisconsin is among a trio of Rust Belt states, along with Michigan and Pennsylvania, that are critical for Democrats' chances of defeating Trump.

"There are independents and young people who did not like their choices, and Harris has a chance to win them," said Paul Kendrick, executive director of the Democratic group Rust Belt Rising.

Milwaukee County Executive David Crowley, a Democrat, said Harris could also help bring back crucial Black voters. "Many of them didn't come along because they were distracted by his (Biden's) age, distracted by his appearance," he said.

Democratic National Committee chair Jaime Harrison, in an interview on NBC's "Today" program, said the party had to move quickly to get the ticket on ballots in all 50 states, and that the vice presidential pick needed to be made by Aug. 7.

"This process is going to be fair, transparent, open but it's going to be fast," Harrison said.

Potential running mates include Kentucky Governor Andy Beshear, U.S. Secretary of Transportation Pete Buttigieg, North Carolina Governor Roy Cooper, Arizona Senator Mark Kelly, Illinois Governor J.B. Pritzker, Pennsylvania Governor Josh Shapiro and Michigan Governor Gretchen Whitmer, according to people familiar with internal policy discussions.