The Congressional Black Caucus PAC (CBCPAC) extended its enthusiastic endorsement of Harris as the presumptive Democratic presidential nominee during a press conference Tuesday.

Chair Gregory Meeks, D-N.Y., expressed the caucus' "full and unanimous support."

"She is the most experienced individual for our safety and security around the world," he said. "She has more experience than any of the past four presidents before President Biden. She's the right person at the right time to get the job done."

The caucus also highlighted recent Zoom calls in which thousands of Black women continue to organize support efforts on behalf of Harris.

Rep. Joe Neguse, D-Colo., explained that he "cannot wait" to hold his 5-year-old daughter's hand and "see this incredibly talented Black woman become President of the United States of America."

-ABC News' Emily Chang

A coalition of major gun safety groups announced their joint endorsement Tuesday of Harris' bid for the top of the ticket, framing the choice for who holds the Oval Office as a matter of grave safety.

The coalition included Everytown for Gun Safety and its grassroots networks Moms Demand Action and Students Demand Action, as well as Newtown Action Alliance and Community Justice Action Fund.

"Throughout her career in public service, Vice President Harris has been a powerful force in the fight for our freedoms -- including the freedom to live free from the threat of gun violence. Gun extremists have a dream ticket with Trump and Vance, and our volunteers stand ready to do everything in our power to elect Vice President Harris back into the White House," Angela Ferrell-Zabala, executive director of Moms Demand Action, said in a statement to ABC News.

Everytown backed the Biden-Harris ticket last year. Brady, another gun-control group, which backed Harris on Sunday, also reiterated its support Tuesday.

"A vote for Kamala Harris is a vote to free America from the grips of gun violence. This November, our lives are on the ballot," Kris Brown, the president of Brady, said in a statement.

Similar groups, Team ENOUGH and GIFFORDS -- founded by Gabby Giffords -- are also endorsing Harris. Giffords' husband is Arizona Sen. Mark Kelly, who a source tells ABC News is among a list of vice presidential hopefuls being vetted to be her running mate.
-ABC News' Sasha Pezenik

Harris rallied voters in battleground Wisconsin on Tuesday, her first presidential campaign event since securing enough delegate pledges for the Democratic nomination if they keep their word -- and used the rally to sharply frame her race against former President Donald Trump.

Harris attacked Trump and his running mate, Ohio Sen. JD Vance, on the issue of abortion and Project 2025, the conservative presidential transition blueprint fronted by the Heritage Foundation.

"We'll stop Donald Trump's extreme abortion bans because we trust women to make decisions about their own body and not have the government tell them what to do," Harris said to raucous applause. "And when Congress passes the law to restore reproductive freedoms, as president of the United States, I will sign it into law."

During the rally, Harris touted her previous experience while making a dig at Trump.

"In those roles, I took on perpetrators of all kinds: predators who abused women, fraudsters who ripped off consumers, cheaters who broke the rules for their own gain," she said. "So, hear me when I say, I know Donald Trump's type."

-ABC News' Fritz Farrow and Sarah Beth Hensley

Biden briefly spoke with reporters as he boarded Air Force One at Dover Air Base on Tuesday.

The president, who tested negative for COVID-19, said he was "feeling well," and didn't respond to questions about bowing out of the race.

Biden had a mask in hand, which he placed in his pocket after he got out of the car before getting on the plane.

The president gave a salute and a thumbs up as he boarded.

-ABC News' Cheyenne Haslett