LAS VEGAS — In the days leading up to Nevada’s caucuses, Democratic anxiety over Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE’s (I-Vt.) growing momentum rose. But those who had the power to influence voters on behalf of another candidate stayed notably silent.

Former Senate Majority Leader Harry Reid Harry Mason ReidGraham signals support for confirming a Supreme Court nominee this year Trump signals he will move to replace Ginsburg 'without delay' Senate Republicans signal openness to working with Biden MORE, the most influential Democrat in the Silver State, voted for uncommitted delegates when he cast his early ballot. The powerful Culinary Union pointedly offered no endorsement, though its message to its 60,000 members took an unmistakable shot at Sanders’s health care plans.

The Las Vegas Sun and the Las Vegas Weekly both split endorsements between former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE and Sen. Amy Klobuchar Amy KlobucharThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill EPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates MORE (D-Minn.). The Las Vegas Review-Journal, owned by Republican mega-donor Sheldon Adelson, sat out the primary entirely.

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As the battle for the Democratic presidential nomination reaches its crescendo, the major institutional players who could have once influenced and mobilized voters are keeping themselves on the sidelines. Major unions, party elders like Reid, big-name activist organizations and even newspapers have either declined to choose a candidate or split their endorsement between two or more contenders.

Their deafening silence, activists and observers say, reflects the large field of candidates, which has not winnowed appreciably after three early contests. Just like voters who remain unable to choose a candidate until the last minute, those party leaders who once played kingmaker roles have also been unable to take sides.

“We have a lot of friends that we have relationships with that are running for president. All of the candidates are talking about issues that impact unions and specifically working families,” said Lee Saunders, president of the influential American Federation of State, County and Municipal Employees (AFSCME).

AFSCME was one of more than half a dozen major unions that backed Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE months before the first votes were cast in the 2016 primary season. This year, Saunders says, “we are in no rush to endorse.”

Other unions still on the sidelines include the American Federation of Teachers, which has narrowed the list of candidates it might back to Biden, Sanders and Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.); Service Employees International Union, which decided against making an endorsement last year; and the National Education Association, the country’s largest union with about 3 million members.

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Only five Democratic governors have publicly endorsed a candidate still in the race, with two of them — Delaware Gov. John Carney John Charles CarneyDelaware Gov. John Carney fends off primary challenge Here's your state's plan for reopening schools Here are the states requiring masks in public MORE (D) and Minnesota Gov. Tim Walz Tim WalzGOP Senate candidate says Trump, Republicans will surprise in Minnesota Presidential race tightens in Minnesota as Trump plows resources into state National Guard activated in Minneapolis after homicide suspect's reported suicide MORE (D) — backing candidates from their own states. Only eight Democratic senators are backing a candidate still in the race, with five supporting favorite sons or daughters. Just two of the Democratic Party’s former presidential nominees, former Secretary of State John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE, who backs Biden; and Michael Dukakis, who endorsed Warren in April; have chosen a candidate.

The most notable absence from the field is former President Obama, who has told friends and allies he hopes to act as a unifying force once the primaries come to a close.

Prominent early state public officials have also held off choosing a horse, in part some said to attract attention from as broad a field as possible.

Some party leaders said the rising influence of social media has come at the cost of institutional endorsers. The larger the field, the more likely it is any endorsement will go to a losing candidate, and the more likely that those influencers will show their currency is not worth what it once was.

The significant number of party leaders staying on the sidelines has added to voter confusion over a consensus nominee, especially as Sanders rises and those competing for middle-of-the-road Democratic voters continue their campaigns.