Democrats are bracing for a long, drawn-out primary season.

With just six weeks until the Iowa caucuses, some Democrats say they don’t expect a likely nominee to emerge anytime soon after early-voting states hold their contests. Instead, they’re preparing for a bruising four-way match-up that could drag on for months as candidates compete for the chance to challenge President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE.

Former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE and Sen. Bernie Sanders Bernie SandersTrump, Biden will not shake hands at first debate due to COVID-19 Sanders tells Maher 'there will be a number of plans' to remove Trump if he loses Sirota reacts to report of harassment, doxing by Harris supporters MORE (I-Vt.) have consistently topped nationwide polls, but Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) and South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE remain key contenders who show no signs of slowing down.

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“It’s going to be uglier than ugly,” one Democratic strategist said, pointing to surveys showing there is no clear winner across the first four states in the nominating process. “It’s going to be a bloody slugfest. And the thing a lot of us fear is that Trump will benefit from all of it.”

Democrats have focused their efforts on electability, making the case for rallying behind the kind of candidate who can topple Trump. Some Democrats say that while a progressive candidate can energize the party’s base and win in the primary, it would be much more difficult for that same White House hopeful to win the general election against Trump.

Julian Zelizer, a professor of history and public affairs at Princeton University, argued that because the top candidates each have strong pockets of support, the primary may even lead to a brokered convention in July.

“Although people always say that, this time it could be true," Zelizer said. “Democrats are so desperate to defeat Trump they have very different visions of how to do this and won’t concede easily.”

The party's top four candidates — two progressive candidates and two moderate candidates — are indicative of where the Democratic Party is right now, said Democratic strategist Michael Trujillo.

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“It shouldn’t be a surprise you are seeing two progressives and two moderates vying for the top spot,” he said, adding that former New York City Mayor Michael Bloomberg Michael BloombergBloomberg rolls out M ad buy to boost Biden in Florida Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Bloomberg pays fines for 32,000 felons in Florida so they can vote MORE is also a wild card in the primary race. “What is the most interesting factor here is that voters are somewhat interchangeable between Biden and Sanders, as they are between Mayor Pete and Sen. Warren.”

“I’d argue it is still a jump ball in every way, and that makes the race to be the Democratic nominee extremely exciting,” Trujillo added.

While the overall field of candidates has shrunk in recent months, it has also seen some late additions, with Bloomberg and former Massachusetts Gov. Deval Patrick Deval PatrickRalph Gants, chief justice of Massachusetts supreme court, dies at 65 It's as if a Trump operative infiltrated the Democratic primary process Top Democratic super PACs team up to boost Biden MORE (D) entering the race, worried Democrats were ill-equipped to defeat Trump.

Voters are also divided, resulting in a race with no clear favorite when considering the early nominating states.

“There’s still a decent amount of time left that one or two people could start consolidating support and narrow it down to a two-person race,” said Democratic strategist Eddie Vale. “But given the amount of uncertainty voters have right now about being definitely settled on their first choice and different strengths these top four have in different early states, I think it’s as likely we go to a brokered convention.”

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One factor contributing to a longer-than-usual primary season, Zelizer said, is the “strong and organized” Sanders-Warren constituency that “won’t disappear.”

Even though Biden leads in national polls, surveys are showing other candidates performing stronger in early states.

In Iowa, for example, Buttigieg has become the top contender in some polls. The RealClearPolitics average of state polls puts him in the lead with the support of 22 percent of people polled.

Sanders ranks higher than the other candidates in New Hampshire, at 19 percent support, according to the RealClearPolitics average, and Biden has strong leads in Nevada and South Carolina.

The Democratic strategist who predicted the primary would be a “bloody slugfest” said this election cycle is reminiscent of 2016, when former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonThe Memo: Trump furor stokes fears of unrest Bloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close MORE and Sanders were locked in a bitter battle for the Democratic nomination. Clinton emerged the winner, but “she was damaged from the primary,” the strategist said.

“And anyone who says Sanders didn’t hurt her has their head in the clouds,” the strategist said. This time around, a brokered convention “could only add further division at a time when we need [unity] most. It’s a bit of a nightmare situation.”