Joe Biden snagged a trio of endorsements from his formal Democratic rivals Monday night in a show of force designed to give the former vice president momentum heading into the critical Super Tuesday contests and stop Bernie Sanders from winning the nomination.

Pete Buttigieg, Amy Klobuchar, and Beto O'Rourke all gave Biden their blessing, handing the former vice president the aura of a nominee ahead of Tuesday's vote where 14 states with 1,357 delegates are up for grabs.

At a rally in Dallas ahead of the Super Tuesday primary contest, Biden was joined on stage by O'Rourke and Klobuchar, and suggested he was already offering them positions in his potential administration.

Turning to O'Rourke, he said: 'I'm gonna guarantee you, this is not the last you're seeing of this guy. You're gonna take care of the gun problem with me, you're gonna be the one who leads this effort. I'm counting on you.'

O'Rourke had run on a pledge to tighten gun control laws and forcibly seize assault weapons, amid a rise in gun massacres in the US.

He told a Democratic primary debate last year: 'Hell, yes, we're going to take your AR-15, your AK-47'. His campaign collapsed soon after.

O'Rourke and Biden were pictured together at a Whataburger in Dallas after he endorsed the former Vice President.

Biden appeared to offer O'Rourke a job, saying 'you're gonna take care of the gun problem with me'

O'Rourke and Biden visited a Whataburger in Dallas, Texas, after he endorsed the former Vice President

Buttigieg got the jump on the endorsements when he joined Biden at the Chicken Scratch restaurant to formally endorse him ahead of Biden's Monday night rally, with the former vice president saying Buttigieg reminded him of his late son Beau Biden.

'I don't think I've ever done this before, but he reminds me of my son, Beau. I know that may not mean much to most people but to me it's the highest compliment I can give any man or woman,' Biden said at the Dallas rally.

Buttigieg praised Biden's leadership and his ability to defeat President Trump in his endorsement.

'When I ran for president, we made it clear that the whole idea was about rallying the country together to defeat Donald Trump and to win the era for the values that we share,' the former mayor of South Bend said.

Pete Buttigieg endorsed Joe Biden's presidential campaign at Chicken Scratch in Dallas, praising Biden's leadership and ability to beat Donald Trump

Amy Klobuchar joined Joe Biden at a rally in Dallas on Monday night to endorse his campaign

'And that was always a goal that was much bigger than me becoming president. And it is in the name of that very same goal that I'm delighted to endorse and support Joe Biden for president,' he said. 'And I do it with great pleasure, knowing just how much we need to do not only to win, which is so very important. And when I say "Win," not just win back the White House but make sure we bring back the vitally important House and Senate and local races with us.'

Buttigieg added: 'I'm looking for a leader, I'm looking for a president who will draw out what is best in each of us.'

Biden's pickups came after Buttigieg exited the presidential race Sunday and Klobuchar dropped out Monday.

Buttigieg endorsed Biden at a stop at a local restaurant in Dallas ahead of the Super Tuesday primary

Joe Biden said Buttigieg reminded him of his son Beau, who died in 2015; the two Bidens are seen embracing at the 2008 Democratic National Convention in November when Joe Biden was nominated to be vice presidentf

Buttigieg faced criticism for his lack of national experience and Biden noted that if he'd had that, the former vice president would likely be endorsing the former mayor.

'I warned Pete that if I were lucky enough to get the nomination that I would be asking him to join. I would be asking him to be involved in the process because there are a generation of leaders of Pete's age, my son, who have unlimited potential. The only thing that stands in their way is access and opportunity to be able to be known nationally. If he had been around another six years, I wouldn't be standing here. Pete would be standing here. I'd be endorsing Pete. I really mean it,' Biden said.

Klobuchar and O'Rourke joined Biden at the Dallas rally Monday evening.

Originally some reports had Buttigieg also attending, which would have been a show of unity between him and Klobuchar, who fiercely battled in the primary debates. But instead he endorsed Biden at a solo event with the candidate.

Beto O'Rourke endorsed Joe Biden at a rally in Dallas

Amy Klobuchar appealed for Democrats to unit behind a candidate

‘How wonderful it is to be standing next to him on a stage when it isn't the debate stage,’ Klobuchar said of Biden Monday night when she and her husband John joined Joe and Jill Biden at a Dallas rally.

Klobuchar appealed for party unity in her remarks.

‘If we spend the next four months dividing our party and going at each other, we will spend the next four years watching Donald Trump tear apart this country,’ she said.

‘It is up to us, all of us to put our country back together, to heal this country and then to build something even greater. I believe we can do this together, and that is why today I am ending my campaign and endorsing Joe Biden for president!,’ she noted.

‘Let’s go Joe, Let’s go Joe, Let’s go Joe,’ the crowd yelled in response.

Biden thanked Klobuchar for her support and closed out his rally with a surprise guest, welcoming O'Rourke to the stage.

'Ladies and gentlemen, tomorrow, March 3, 2020, I will be casting my ballot for Joe Biden,' O'Rourke told the cheering crowd.

'It's the right thing to do. Let me tell you why. We need somebody who can beat Donald Trump. The man in the White House today poses an existential threat to this country. To democracy. To free and fair elections. And we need somebody who can beat him and in Joe Biden we have that man. We have someone who is the antithesis of Donald Trump. Joe Biden is decent, he's kind, he's caring, he's empathetic,' he said.

The show of force and unity will boost Biden's electability argument. Polls show Democratic voters rate a candidate's ability to beat President Donald Trump in November has high on their list of concerns.

The back-to-back-to-back endorsements also are a sign that Democrats are joining forces to stop Sanders as many are concerned his liberal policies would turn off voters in the general election, handing Trump a second term.

The endorsements came in Texas, which is one of the 14 states that hold its presidential primary on the first Tuesday in March, which is known as Super Tuesday.

Texas and California are two of the richest prizes in terms of delegates Tuesday. Sanders, who has a slight lead ahead of Biden in the delegate count, leads in the polls in both states.

The endorsements will boost Biden's argument he is the best candidate to beat Donald Trump in November

Bernie Sanders told CNN he wasn't surprised moderates were lining up to try and end his candidacy

Sanders said he wasn't surprised the moderates were trying to stop his candidacy.

'It is no surprise they do not want me to become president because our administration will transform this country to create an economy and a government that works for all of the people not just the 1 per cent,' the Vermont senator told CNN Monday night.

'It will not be the same old same old. But the other reason that I am running is to defeat Donald Trump. And the fact of the matter is if we want to defeat Donald Trump, we're going to need a campaign that has energy and excitement that can speak to working people, young people, people who have given up on the political establishment. All over the country. To defeat Donald Trump, we're going to have the highest voter turnout in the history of this country and I think our campaign is uniquely suited to be able to do that,' he noted.

Sanders held a rally in Klobuchar's home state of Minnesota Monday night as his rivals rallied in Texas.

Biden got in a knock at Sanders and Michael Bloomberg at his Dallas event, not mentioning the Vermont senator by naming but referring to the fact Sanders is a longtime Independent who caucused with Democrats and that Bloomberg was once the Republican mayor of New York.

‘The Democrats want a nominee who’s a Democrat, a life-long Democrat, a proud Democrat, an Obama-Biden Democrat,’ he said.

Former Vice President Joe Biden speaks after being endorsed by Pete Buttigieg

O’Rourke had started off strong for the Democratic nomination with a cover of Vanity Fair declaring he was ‘born for’ the contest. But his campaign faded as fast as it rose.

He dropped out of the primary last fall, returned to his native El Paso and largely stayed out of the campaign until Monday night.

Klobuchar, a senator from Minnesota, endorsed as she exited the race. She had momentum coming out of the New Hampshire primary, but couldn't repeat the result in the more diverse states of Nevada and South Carolina who held contests the last two Saturdays.

Her announcement comes one day before voters in her home state of Minnesota were to go to the polls as the Super Tuesday contests, when one-third of the delegates needed for the nomination are up for grabs.

Klobuchar looked poised to do well in Minnesota and Minnesota only.

And Sanders, having the high-profile endorsement of Rep. Ilhan Omar, one of the four members of the so-called squad, could have eaten into Klobuchar's totals in that state.

With the blessing of Klobuchar and Buttigieg, Biden appears to be consolidating moderate Democrats to go up against Sanders, a liberal who refers to himself as a democratic-socialist and is technically one of the Senate's two independent lawmakers.

Out: Amy Klobuchar becomes the latest to quit the race, meaning there have been three departures in less than 36 hours

Two women still standing: Massachusetts senator Elizabeth Warren and Hawaii congresswoman Tulsi Gabbard are the youngest two of the five Democratic candidates

The optics of both Klobuchar and Buttigieg onstage with Biden will be a real show of unity for the moderate wing of the party after the Minnesota senator and the Indiana mayor had several heated moments on the debate stage.

Klobuchar referred to Buttigieg as a 'local official' and a 'cool newcomer,' and suggested that sexism was at play to allow a 38-year-old man with a thin resume to be seriously considered for the White House.

Buttigieg, in turn, took advantage of some of Klobuchar's missteps, including when she couldn't recall the name of the president of Mexico.

Since winning the South Carolina primary over Sanders on Saturday night, Biden has seen a number of mainstream Democratic politicians endorse his campaign.

The first out of the gate was former Virginia Gov. Terry McAuliffe, who campaigned for Biden in Virginia over the weekend.

Sen. Tim Kaine, who was Hillary Clinton's vice presidential pick in 2016, had previously announced his support for Biden and also campaigned for the ex-veep in the commonwealth.

Biden picked up former Senate Democratic Leader Harry Reid Monday as well. Reid declined to endorse a candidate in the run-up to the Nevada caucuses last month. Sanders crushed Biden there by 26.6. points.

Still in it: Mike Bloomberg and Bernie Sanders both hit the campaign trail ahead of Super Tuesday. The billionaire former New York mayor was in Manassas, Virginia and the Vermont senator was in Salt Lake City, Utah

Ahead of California's vote, Biden snagged former Sen. Barbara Boxer's endorsements too.

Klobuchar's exit means that just five Democratic candidates remain: Biden, Sanders, Elizabeth Warren, Michael Bloomberg and Tulsi Gabbard.

While Biden and Sanders look to be in the strongest position to win the nomination, Bloomberg and Warren, who is campaigning in East Los Angeles Monday night, have become wild cards.

Bloomberg, worth $55.4 billion, hasn't participated in the first four primaries and so the strength of his campaign, and the hundreds of millions he's poured into it, won't be measurable until the results of 'Super Tuesday' come in.

Warren has had two impressive debate showings and outraised Biden in February, receiving $29 million to Biden's $18 million. Sanders earned the most in February, bringing in $45.6 million.

Fundraising clearly played into both Buttigieg and Klobuchar's decisions. Klobuchar ended January with just $2.8 million in the bank. However, she raised almost that much - $2.5 million - in the day following her third place finish in the New Hampshire primary.

Buttigieg fundraising had been strong through the race, but by the time the Nevada caucuses rolled around, he was pleading for $13 million more to get through Super Tuesday.

Both Warren and Sanders will be in their home states on Tuesday, while Biden will be in Los Angeles, California.

Gabbard, a congresswoman from Hawaii, hasn't been actively campaigning.