Vulnerable House Democrats are elated — and breathing a huge sigh of relief — after Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE's stunning series of victories on Super Tuesday.

They had feared that Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.), a self-described democratic socialist, would cause a down-ballot disaster by winning the nomination, warning that he could cost them many of their swing seats — and control of the House.

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But Biden's return to front-runner status has eased Democrats’ nerves on Capitol Hill and throughout the party establishment in Washington, at least for the time being.

“It’s a huge sea change. It’s the first signs of what we hoped consolidation on our side would provide, which is a firewall against Bernie,” one endangered House Democrat said Wednesday. But he cautioned: “Now we will see what [Sen. Elizabeth] Warren does. It will be a long winter and early spring. These guys aren’t exactly the pack-up-and-go-home crowd.”

Rep. Charlie Crist Charles (Charlie) Joseph CristFlorida Democrat introduces bill to recognize Puerto Rico statehood referendum Anna Paulina Luna wins Florida GOP primary in bid to unseat Charlie Crist The feds should not spend taxpayer dollars in states that have legalized weed MORE (D-Fla.), who’s being targeted by Republicans this cycle, was practically prayerful in cheering Biden's big day, suggesting Democrats dodged a bullet with his sudden surge and predicting the former vice president will have the nomination wrapped up by the time of the convention.

“The Joe-mentum is on, and it's great,” Crist said in the Capitol. “Joe Biden is on a path ... and it seems to be getting stronger by the day. It’s great for America. Thank God!”

Biden’s dramatic rebound shocked Capitol Hill Democrats — and the rest of the country. He took 10 of 14 Super Tuesday states, including Texas, Minnesota, Maine and Massachusetts. In those final three states, he was a huge underdog 24 hours before polls opened.

He also raced to sweeping victories in the South on the strength of African American voters in North Carolina, Tennessee, Alabama, Arkansas and Virginia — where there was a surge in Democratic turnout from 2016.

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While Sanders claimed four states, including the biggest delegate prize of the night in California, the delegate lead he hoped to grab disappeared, and instead it appeared that Biden could be in the lead when all the Super Tuesday votes are counted.

Some longtime Democrats described the wild and unpredictable swing in Biden’s direction these past four days as nothing short of a miracle.

“It was amazing. I never would have predicted such a victorious evening. I’ve seen many elections over decades, but I have never witnessed anything so phenomenal. It’s almost like all the stars aligned with the moon and the sun to cause this domino effect to take place on behalf of this good man who should be president,” said Rep. Frederica Wilson Frederica Patricia WilsonHarris calls it 'outrageous' Trump downplayed coronavirus House passes bill establishing commission to study racial disparities affecting Black men, boys Florida county official apologizes for social media post invoking Hitler MORE (D-Fla.), a supporter of Biden. “That was in no master plan, in no one’s vision, in no one’s blueprint as to what was going to happen on Super Tuesday.”

Another House Democrat was less poetic but blunter about what had happened: “It’s literally like shitting out a diamond.”

In the weeks leading up to Super Tuesday, centrist and establishment Democrats had sounded the alarm as Sanders, the liberal firebrand outsider pushing “Medicare for All” and the Green New Deal, appeared to be marching to the nomination. He won the popular vote in Iowa, captured New Hampshire and blew Biden and the rest of the field away in Nevada with a boost from Latino voters.

But Biden resuscitated his struggling campaign last weekend with a key endorsement from House Majority Whip James Clyburn (D-S.C.) — a development that helped him run up the score over Sanders by nearly 30 points in the Palmetto State, win the endorsements of moderate rivals Pete Buttigieg Pete ButtigiegBogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq A socially and environmentally just way to fight climate change MORE and Sen. Amy Klobuchar Amy KlobucharEPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates Biden marks anniversary of the Violence Against Women Act, knocks Trump and McConnell MORE (D-Minn.) and generate a burst of momentum heading into Super Tuesday.

Another moderate, former New York City Mayor Michael Bloomberg Michael BloombergThe Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support MORE, dropped out and endorsed Biden on Wednesday.

“We all feel much more certain now, which is positive,” said Rep. Pete Aguilar Peter (Pete) Ray AguilarRep. Robin Kelly enters race for Democratic caucus vice chair Pelosi seeks to put pressure on GOP in COVID-19 relief battle Races heat up for House leadership posts MORE (D-Calif.), the Democrats’ chief deputy whip who had previously endorsed Bloomberg. “Anytime we can move away from the circular firing squad and all get on the same page is a very positive thing.”

Establishment Democrats are now exuding confidence that Biden will be the party's nominee, even as the former vice president’s allies concede he may arrive at the Milwaukee convention in July just shy of the simple majority of delegates needed to win the nomination on the first vote.

If that’s the case, multiple rounds of voting may be necessary to award Biden the nomination, these members said.

Asked if Biden would be the party’s standard-bearer, Rep. John Garamendi John Raymond GaramendiWuhan is the final straw: The world needs to divest from China GOP seizes on 'defund the police' to galvanize base Peace Corps faces uncertain future with no volunteers in field MORE (D-Calif.) simply replied: “Yes. Count on it.”

Even Sanders supporters acknowledged that Biden had an impressive run in consolidating moderates’ support and turning around his campaign in a matter of days.

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“Anyone who diminishes Joe's last 72-plus hours is making a mistake. He had a very strong showing,” said Rep. Mark Pocan Mark William PocanClark rolls out endorsements in assistant Speaker race Hillicon Valley: Pentagon reaffirms decision to award JEDI contract to Microsoft | Schiff asks officials for briefing on election security threats Democrats explore new ways to resurrect election security briefings MORE (D-Wis.), a leader of the Congressional Progressive Caucus.

But they indicated that the divisions still remain among progressive voters wary of the party establishment.

“When you have people with power and platform and the Democratic Party coming out and saying, you know, Bernie Sanders is going to destroy the country or destroy the House majority or the Senate majority, that resonates badly for young people no matter what we've done to empower them,” said Rep. Pramila Jayapal Pramila JayapalProgressive Caucus co-chair: Whistleblower complaint raises questions about 'entire detention system' Buttigieg, former officials added to Biden's transition team A Biden-Harris presidency would largely end oil and gas production MORE (D-Wash.), another Progressive Caucus leader.

“That sends a very different message that will hurt us in November,” she said.

Yet House Democrats in competitive districts remain quite concerned that Sanders could still eke out a win and doom the party’s chances in November.

Freshman Rep. Donna Shalala Donna Edna ShalalaShakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' Hillicon Valley: Dems seek to expand DHS probe after whistleblower complaint | DHS rejects House subpoena for Wolf to testify | Facebook rolls out new features for college students Democrats call for narrowing digital divide to help students during pandemic MORE (D-Fla.) didn’t mince words when asked how Sanders would likely play in her South Florida swing district.

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“Are you kidding? He'd be a disaster,” Shalala said.

Shalala, a former Cabinet secretary under President Clinton, has not yet endorsed a presidential candidate, but she made clear there’s one she definitely won’t support.

“I don't think that Bernie should be our candidate. And I don't think he's going to be our candidate,” Shalala said.

Mike Lillis contributed.