Appearing at the influential Culinary Workers Union on Wednesday — after Sens. Elizabeth Warren and Bernie Sanders visited on Monday and Tuesday — former Vice President Joe Biden touted the immigration plan he released that day promising to reverse many of President Donald Trump’s policies. He stood on stage with two immigrant workers who the union said once worked as housekeepers at Trump National Golf Club in New Jersey, and he extolled the immigrant spirit, telling a boisterous crowd that people come to the United States is because ‘you have no alternative, but also because you have resolve, you’re optimistic, you’re resilient, you know how to fight.”

Then, swiping at his more progressive rivals’ proposals of “Medicare for All” and leaning into union members’ concerns about maintaining union health care, Biden said, “You’re going to get to keep it with me.”

As evidenced by a surge of activity here this week, the campaign in Nevada is finally getting up to speed. By this weekend, Sanders’ campaign expects to have 100 staffers in Nevada, dramatically expanding an operation that is already the largest in the state. South Bend, Ind., Mayor Pete Buttigieg, who is desperate to improve his weak standing with black and Latino voters nationally, opened 10 offices in Nevada between mid-September and mid-October.

He is now airing ads on urban radio stations in the state targeting black voters. Biden is preparing to run paid ads in Spanish, and on Wednesday, Booker’s campaign said it was launching a bilingual caucus training program in the state.

The lack of diversity in the remaining primary field is offering the chance for campaigns to reset in Nevada, the effects of which are only now settling in.

“People are incredibly demoralized about that,” said Bob Fulkerson, a Warren supporter who co-founded the Progressive Leadership Alliance of Nevada. “It’s definitely the biggest failure of the campaign so far … the all-white crowd that we’re left with, and what forces institutionally have led to that.”

He said, “The whole field is diminished, and the whole process is diminished.”

The disconnect between a white top tier and the Democratic Party’s diverse electorate was nowhere more apparent than at Culinary, where a trio of white candidates this week courted one of the most powerful, majority-Latino organizations in the country.

The town hall meetings served as a preview of the presidential debate next week in Los Angeles in which only one non-white candidate, Andrew Yang, has qualified. Rep. Norma Torres (D-Calif.), said she feared that as the primary loses candidates of color, it will also see issues of particular concern to non-white voters — such as voter suppression and immigration — begin to fade.

On the same day that Sanders addressed Culinary, Castro, the only Latino in the race, was in Iowa, lamenting that because Nevada and other diverse states come later in the primary schedule, some candidates will never make it there.

At the beginning of the campaign, said Grace Vergara-Mactal, executive director of Service Employees International Union Nevada Local 1107, “we had the most representative primary candidates in history, so that was very exciting, at least to me and my members.”

Now, she said, “At least in my mind, the excitement in the beginning of having a diverse candidate is fading … I think we’ve got to ask the question: what kind of message is the Democratic Party sending to voters of color?”

In three days of campaigning in Nevada, Biden toured a solar farm in Boulder City while Sanders spoke at a Serbian Orthodox church in Las Vegas and sprinted from Elko, in a rural stretch of the state, to Reno, where Warren also campaigned.

The Massachusetts senator’s campaign has been on the ground in Nevada for almost a year and has about 50 full-time staffers and nine offices spread across the state. But the size of her operation — once viewed as almost insurmountable — has been eclipsed by Sanders. Jeremy Ross, political director of the Bartenders’ Union Local 165 in Las Vegas, said the Vermont senator “still has a lot of his base” from 2016.

Buttigieg now has about 55 staffers in the state, according to his campaign. And Biden’s operation has grown to more than 40 people. In addition, Biden continues to rack up institutional endorsements, including from three former Nevada Democratic Party chairs and Richard Bryan, the former governor and senator.

An former adviser to Harris’ campaign said Nevada caucus-goers who supported Harris largely for ideological reasons would probably shift to Biden, while those drawn to her profile as a woman of color would move to Warren.

Organizationally, said Andres Ramirez, a Nevada-based Democratic strategist and former vice chairman of the Democratic National Committee’s Hispanic Caucus, Warren’s advantage “is not as lopsided” as it was before.

“It’s definitely a different view today than it was a couple of months ago,” he said.

William McCurdy, chairman of the state Democratic Party, said that even with just more than two months before the Nevada caucuses, it is “still early” here. Personal connections matter in Nevada, he said. “No one is out of it, and the ground game is going to be the key.”

In their visits to Culinary, Biden, Sanders and Warren were all courting an endorsement that could prove pivotal in the campaign. Yet the union does not appear to be on the cusp of an endorsement.

D. Taylor, president of Culinary’s parent union, UNITE HERE, said in an interview that if the union endorses, he hopes it will wait until after the Iowa caucuses, in part because “we have no members in Iowa” and in part because “the herd is going to thin out.” He later added that the timing of any endorsement — whether before or after the Iowa caucuses — is unsettled.

Biden on Wednesday faced a critical question at his town hall about the high number of deportations during his time in former President Barack Obama’s administration. And the two progressive Democrats, Warren and Sanders, both confronted ongoing skepticism from union members about the effects of “Medicare for All” on their own, existing plans.

Union leaders say maintaining union health care is a priority, and a small group of hecklers shouted over Sanders on Tuesday, “Union health care.”

“Let me deal with the issue that’s on your mind,” Sanders told them. “Because we spend so much for health care, your employer is spending a lot on your health care.”

Cost savings under "Medicare for All," Sanders said to applause, would be passed on to employees.

Later that day, at a Sanders rally across town, Jessica Ledford, a Sanders supporter, said the dearth of competitive non-white candidates doesn’t trouble her as long as the candidates who do remain are support improving worker conditions, expanding health care access and otherwise advocating for policies that will benefit people of color.

Still, Ledford said it would be “nice to see” a field that is more reflective of the population.

“I hope that one day [Rep. Alexandria Ocasio-Cortez] will run for president,” she volunteered. “That would be great.”