Kentucky Gov. Andy Beshear spoke on Sunday at the opening of Kamala Harris' campaign office in Forsyth County, Georgia.

The possible VP pick for Harris has been an effective surrogate for the vice president’s White House bid over the weekend, coming to the metro Atlanta event fresh off of a stump in Iowa on Saturday night.

The red-state governor introduced himself to the Southern audience on Sunday while boosting Harris’ candidacy and taking a number of swipes at Trump’s Vice Presidential pick, JD Vance.

"Are you ready to beat Donald Trump? Are you ready to beat JD Vance? Are you ready to elect Kamala Harris president of the United States of America?" Beshear asked the crowd, adding, "Let's win this race,"

"Let me tell you just a bit about myself," Beshear said. "I'm a proud pro-union governor. I'm a proud pro-choice governor. I am a proud pro-public education governor. I am a proud pro-diversity governor and I'm a proud Harris for president governor," he added.

Calling out Vance, Beshear said, "Just let me be clear. JD Vance ain't from Kentucky. He ain't from Appalachia. And he ain't gonna be the vice president of the United States."

-ABC News' Isabella Murray

Former Vice President Al Gore endorsed Vice President Kamala Harris on Sunday.

"As a prosecutor, [Kamala Harris] took on Big Oil companies -- and won. As [VP], she cast the tie-breaking vote to pass the most significant investment in climate solutions in history, the Inflation Reduction Act. That's the kind of climate champion we need in the White House," he wrote on X.

"With so much at stake in this year's election -- from strengthening democracy in the US and abroad, to expanding opportunity for the American people, to accelerating climate action -- I’m proud to endorse Kamala Harris for President," he added.

-ABC News' Oren Oppenheim

During a quick stop at a diner in Minnesota on Sunday morning, Sen. JD Vance on Sunday spoke about his past criticisms of former President Donald Trump.

When asked by ABC News if he and Trump have talked about his past criticism of the former president, Vance said yes, adding that Trump "doesn't care about what I said eight years ago."

"I mean, look, President Trump and I have talked a lot about this," Vance said. "In fact, I sometimes joke that I wish that he had the memory of Joe Biden, because he's got a memory like a steel trap, and he certainly remembers criticisms that people have made."

"But this is where the media, I think, really misses Trump -- Donald Trump accepts that people can change their mind, and you ask, 'Why did I change my mind on Donald Trump?' Because his agenda made people's lives better," Vance said.

"This whole thing is not about red team versus blue team or winning an election for its own sake. It's about getting a chance to govern so that you can bring down the cost of groceries, close that border and stop the fentanyl coming across our country for four years,” Vance continued, saying he was "wrong" about Trump.

"He did a better job of that than anybody that I've ever seen as president in my lifetime. So I changed my mind, because he did a good job. And that's what you do when people do a good job and you're wrong. I've talked to President Trump a lot about it, but look, he, I mean, he just, he doesn't... He doesn't care about what I said eight years ago. He cares about whether we together [and] can govern the country successful.”

When asked again if the two have talked about the subject, specifically in the last week since his comments have resurfaced, Vance admitted that they haven't spoken about it and their conversations have focused on the race ahead.

-ABC News' Kelsey Walsh, Soorin Kim and Hannah Demissie

Vice President Kamala Harris' campaign raised more than $200 million in less than a week, with more than two-thirds of the total coming from first-time donors, the campaign said Sunday.

The total raised amounts to a "record-shattering haul," the campaign said. ABC News is unable to independently verify the numbers until they've been filed with the Federal Election Commission.

Harris, who has crisscrossed the country since President Joe Biden's endorsement last Sunday, held the campaign's largest rally to date in Milwaukee on Tuesday.

Her campaign said it would host more than 2,330 events in battleground states this weekend to mark 100 days until the Nov. 5 election.

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

The Democratic National Committee (DNC) has proposed moving forward with the virtual roll call for delegates to select a presidential nominee ahead of their in-person convention in Chicago on August 19, party leadership said Monday evening during a press briefing.

The party has not proposed a date when the virtual roll call will begin, but DNC Chair Jaime Harrison said they will still deliver a nominee by Aug. 7, but may come as soon as Aug. 1.

A DNC official also confirmed during the briefing that only pledged delegates -- and not automatic delegates (superdelegates) -- can vote on the first round of virtual roll call voting (first ballot), unless any candidate has secured a majority of all delegate votes. It is also possible for automatic delegates to vote on the first ballot -- though it would not be easy, according to the DNC official, and could only happen if a candidate were to submit a majority of the convention delegates in support of their nomination petition, rather than a required 300 delegate signatures.

On Monday, Harrison and Democratic National Convention Committee Chair Minyon Moore said that the truncated virtual process, which was proposed after a ballot access issue in Ohio that has since been resolved, will still "ensure" that their nominees are on the ballot in all 50 states and the District of Columbia.

"There is still a need for a virtual component to our nominating process. That has not changed, as we laid out in May, we are committed to meeting valid access deadlines," Moore said.

“Immediately after President Biden withdrew from the race, Republican leaders, including Speaker Mike Johnson, made clear that they would file losses to challenge the Democratic nominee's place on the ballot. That's why we are working in close collaboration with the convention Rules Committee on a framework for the nominating process, which will incorporate an electronic voting system to ensure we meet these deadlines,” she added.

Delegates will be informed about possible candidates through a "a candidate directory" that will be provided to them, and delegates can opt into communications from those candidates.

A DNC official later clarified that interested candidates can be included in the directory even before reaching 300 signatures.

-ABC News' Oren Oppenheim and Isabella Murray