Democrats have moved swiftly behind Vice President Harris as their next standard-bearer in the hours since President Biden dropped out of the race and endorsed her as his successor.

Top Democratic leaders, potential rivals for the nomination, state delegations to the nominating convention, unions, activist groups and party donors have lined up behind Harris following Biden’s historic announcement on Sunday.

Some Democrats have called on the party to pump the brakes and consider alternatives. But Harris’s ability to quickly solidify support appears likely to head-off any serious challengers.

Democrats were jubilant Monday as the money started flowing back into their campaign coffers. While Harris’s position in the race against former President Trump won’t be known until new polling starts rolling in, Democrats believe she gives them new hope heading into November.

Harris will travel to the Biden campaign’s reelection headquarters in Wilmington, Del., on Monday to rally the staff.

Here’s a roundup of how Harris has effectively cleared the field:

• A majority of Democrats in the House and Senate have endorsed Harris, including leaders such as Reps. Nancy Pelosi (Calif.), Adam Schiff (Calif.), James Clyburn (S.C.), Jamie Raskin (Md.), House Democratic Caucus Chair Pete Aguilar (Calif.), and Democratic Whip Katherine Clark (Mass.). The same is true in the Senate, where leaders such as Majority Whip Dick Durbin (Ill.) and Elizabeth Warren (Mass.) are on board.
  
  

• Most of Harris’s would-be rivals for the nomination have announced their support for her, including Transportation Secretary Pete Buttigieg, and Govs. Gavin Newsom (Calif.), Gretchen Whitmer (Mich.), Wes Moore (Md.), Josh Shapiro (Penn.), Roy Cooper (N.C.), JB Pritzker (Ill.) and Andy Beshear (Ky.).
  
  
• Democrats have raised more than $100 million on ActBlue in the 24 hours since Biden dropped out. Politico reports that the largest pro-Biden super PAC, Future Forward, has received pledges of more than $150 million since Biden stepped aside. Voto Latino has pledged $44 million to Harris. Hollywood donors are back, according to Deadline.
  
  
• The Congressional Black Caucus (CBC) is backing Harris, as are three PACs representing AAPI, Black and Latino voters.
  
  
• Harris has the support of more than 500 delegates to the Democratic convention next month in Chicago. The eventual nominee must secure 1,986 to win. Follow The Hill’s delegates tracker here.
  
  
• Key unions and activist groups have come out in support of Harris, including the American Federation of Teachers, the SEIU and the Human Rights Campaign.

Still, there are a major endorsements hanging out there, including former President Obama, Senate Majority Leader Chuck Schumer (D-N.Y.) and House Minority Leader Hakeem Jeffries (D-N.Y.).

Schumer and Jeffries released a statement saying they will meet with Harris as the process plays out:

“Vice President Kamala Harris is off to a great start with her promise to pursue the presidential nomination in a manner consistent with the grassroots and transparent process set forth by the Democratic National Committee. She is rapidly picking up support from grassroots delegates from one end of the country to the other. We look forward to meeting in person with Vice President Harris shortly as we collectively work to unify the Democratic Party and the country.”

There are some Democrats who would prefer a “mini-primary” rather than immediately backing Harris.

• Rep. Dean Phillips (D-Minn.), who was one of the few to challenge Biden in the primary, suggested a straw poll and a series of debates.
  
  
• Sen. Joe Manchin (I-W.Va.), who was reportedly thinking about challenging Harris, will not run for president. But he called for a “vigorous, maybe three-week” process to determine the nominee because he believes Harris is “too far left.”
  
  

The Democratic National Committee has promised a “transparent and orderly process” to choosing the next nominee. 

But with Harris holding the inside track, the big question in Washington is who she’ll choose as her running mate.

Michigan Gov. Gretchen Whitmer (D) will co-chair the Harris campaign, but she says she’s staying put.

The Hill’s Julia Manchester and Julia Mueller have the early list of potential vice presidential picks, led by:

• Pennsylvania Gov. Josh Shapiro, who is enormously popular in the critical “Blue Wall” state.
  
  
• Kentucky Gov. Andy Beshear, who has proved to be a popular leader of a deep red state.
  
  
• Transportation Secretary Pete Buttigieg, who is one of the party’s best communicators and a young star with a compelling life story.
  
  
• North Carolina Gov. Roy Cooper, who could help Democrats win back a key swing state that has gone narrowly for Trump in the past two election cycles.
  
  
• Sen. Mark Kelly (Ariz.), the former astronaut and husband to former Rep. Gabby Giffords (D-Ariz.), could help cut into Trump’s widening lead in battleground Arizona.
  
  
• Maryland Gov. Wes Moore, a rising star in the Democratic Party.

Biden is still recovering from COVID-19 at his home in Rehoboth Beach, Del. Biden’s doctor said Monday his symptoms have “almost resolved completely.” He has not appeared in public or released any video or audio statements since announcing on X that he will not run for reelection.

The White House says Biden will speak about his decision to drop out later this week, although they have not said when he’ll return to Washington. He’s also scheduled to meet this week with Israeli Prime Minister Benjamin Netanyahu, who will give a joint address to Congress on Wednesday night.

Perspectives:

• Lee Fang: Searching for the real Kamala Harris.
• Freddie Deboer: There will be no Democratic process from the Democrats.
• The Los Angeles Times: Who might Harris choose as a running mate?
• The Memo: Harris closes in on Democratic nomination.
  

Read more:

• Harris gives Democrats hope of galvanizing younger voters.