INDIANOLA, Iowa — Daniel Hyer drove eleven hours from Columbus, Ohio, to support 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.). In the days leading up to the Iowa caucuses Monday, he and the six friends sharing his Airbnb in this small college town will knock on doors, call voters and sit through a training that will teach them how to corral Sanders supporters at a precinct in the area.

For all the millions of dollars spent on television advertisements and mail pieces, survey research and office space, it is volunteers like Hyer, and the organizations they represent, who can make the difference between a strong performance that propels a candidate forward into subsequent primaries and a weak showing that dooms a candidate to the footnotes of history.

“We know how important it is,” Hyer said.

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The leading Democratic campaigns have spent a year building robust armies of volunteers across Iowa, volunteers they will deploy to caucus sites with instructions to build and hold coalitions of supporters in each of the state’s 1,700 precincts. Those volunteers are armed with talking points meant to persuade supporters of other candidates who might not meet viability thresholds to switch allegiances after the initial round of voting takes place.

“The caucus is all about organizing, and we’ve taken organizing very seriously, I think more seriously than any other candidate in the state,” said Misty Rebik, Sanders’s Iowa campaign director.

Sanders’s campaign will have at least one precinct captain at every caucus site. At locations where big crowds are expected, they plan multiple leaders, Rebik told The Hill. Former South Bend, Ind., Mayor 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’s campaign has trained about 5,500 precinct leaders in Iowa, a spokesman said.

Other campaigns declined to detail their organizing plans ahead of Monday’s caucuses. But in such a tight race, as polls show four and possibly five candidates with a chance to win the first delegates in the march to the Democratic presidential nomination, the quality of the teams they have built will matter on a cold weeknight, when voters have to stand for hours among friends and neighbors, publicly declaring — in some cases several times — which candidates they support.

“If you don’t have people on the ground that know Iowa, then you’re at a disadvantage,” said Rob Sand, Iowa’s Democratic state auditor. “You could literally lose people because you don’t have a precinct captain.”

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Caucus calculus is confusing enough on its face. Candidates must receive 15 percent of the vote in an initial alignment in order to stay viable. Supporters of those who do not reach the viability threshold are then free to migrate to a viable candidate’s team. Speeches ensue, arms are twisted, friendships tested, and hours can tick by.

“Organization is so important because people you respect, their neighbors, are able to convince [voters] and then it’s really important to get them out to the caucus and then to organize them at the caucus, to try and get the maximum delegates,” said Tom Miller, Iowa’s Democratic attorney general, who backs former Vice President 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.

A strong and dedicated volunteer base is likely to matter even more this year, with so many candidates hovering just above or below the viability threshold. A huge percentage of Iowa Democratic voters have held off on deciding who they will support, conscious both of the wide array of options before them and the pressure they feel to choose a candidate who can beat President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE in November.

“Iowans have really had ample opportunity, and they’ve seized it, to meet a lot of the candidates, a lot of them multiple times,” said John Norris, a former state Democratic Party chairman who is backing Warren. “The angst over the decision and electability is just crazy.”

In some cases, campaigns make mutually beneficial deals to cooperate or align on caucus night. If one candidate does not reach the 15 percent threshold required to win a delegate in a given precinct, his or her precinct captain will encourage supporters to migrate en masse to another candidate’s team.

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In 2008, supporters of then-Sens. Barack Obama Barack Hussein ObamaGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high D-Day for Trump: September 29 Obama says making a voting plan is part of 'how to quarantine successfully' MORE and John Edwards crafted an alliance to help deny delegates to the national front-runner, Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE.

Charlie Jordan, who will captain a precinct for Biden in Des Moines, said Thursday she had already received her marching orders. She said Biden’s coalition would be a natural home for supporters of 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.), who is hovering just under the viability threshold in most public polling.

“You look at the weak ones,” Jordan said, a hint of mischief in her eye. “Her supporters would be fantastic for us, but I really think she’s going to have a fantastic turnout.”