For tens of millions of Americans overridingly concerned with finding a presidential candidate who can beat Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE in 2020, how the left-of-center and abnormally large Democratic primary field is shaping up is a topic of some trepidation.

A series of changes to the Democratic nominating process, new campaign practices, the size of the field and the rules for apportioning delegates together have greatly increased the chance that no Democratic candidate gains a majority of delegates before the convention convenes in Milwaukee in July 2020, leading to a brokered convention.

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The chance that a candidate who gains far less than a majority of a primary’s popular vote — say 30 percent — will come away with most or even all of the delegates in many states is equally daunting.

That may mean that a left-wing candidate like Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.) enters the convention with a majority of delegates but a very small plurality of the popular vote. This eventuality could risk dividing the party’s far left and its more moderate wings.

With these risks in mind, Democrats must focus on methods to unify the party during and after the primary season, keeping the focus on beating Trump.

So, what brought us to this dangerous impasse?

First, the nature of delegate selection rules. They require that a candidate gain 15 percent of the vote in each and every congressional district in a state in order to get any delegates from that state, a method intended to allow one top vote-getter to gain a majority of delegates and actually prevent a brokered convention.

But these rules were adopted in an era when presidential primary fields were much smaller, typically three to five serious candidates. Right now, 15 candidates have announced, with at least three or four more expected to join. This huge field increases the chances that no one will win a majority of delegates.

Second, the primary season is now heavily front-loaded, especially with liberal states. The California primary has moved from June to March 3, now part of the Super Tuesday delegate bonanza. New York has also moved its primary ahead of Super Tuesday.

In total, 64 percent of all delegates will be chosen in the first six weeks of the primary season — by March 17. If the field stays above 10 candidates into mid-March, the Democrats may have a new kind of March Madness on their hands, with widely fragmented support dividing the popular vote, and maybe the delegate count as well.

The third major change is the prohibition against superdelegates counting on the first ballot. This decision by party leaders was arrived at after concerns that Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE’s reliance on superdelegates to gain the 2016 nomination alienated Sanders voters, depressing turnout in November among younger voters. In practice, this change will prevent superdelegates from rallying around a more electable frontrunner.

The fourth change is the ability of candidates to self-fund by getting thousands of small, online donations. No longer can a handful of top Democratic fundraisers dominate the process as often happened in past campaigns in which they had an outsized role in siding with a candidate they perceived as most likely to prevail in a general election.

Indeed, the small-donor emphasis is actually recognized in the party rules that require any candidate to have 65,000 separate donors and at least 200 donors in 20 different states in order to qualify for the Democratic debates, which begin this June.

Finally, since a number of candidates have won statewide elections in very populous states — including Sen. Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.), Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.), Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.), Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) and ex-Rep. Beto O’Rourke (D-Texas) — there could be a widespread “favorite son or daughter” effect, further fragmenting delegates.

All of these factors increase the chances that that no candidate will gain a majority of delegates going into the convention in July 2020 or that any candidate with a majority of delegates will in fact have gained a relatively small proportion of the popular primary vote.

The implications for a convention without a majority popular vote winner or majority delegate-winning candidate are not necessarily reassuring if the main goal is beating Trump.

For example, in a Democratic Party obsessed with plurality-based fairness, it will be very difficult to deny the candidate with the most delegates the nomination, as happened in previous eras.

But with such a large field, that could very well turn out to be a candidate from the left who may run less effectively against Trump, especially in key Midwestern and industrial states of Ohio, Pennsylvania, Michigan and Wisconsin, all which Trump won in 2016 and where the election is likely to be decided.

So, how can Democrats head off the possibility of mayhem in Milwaukee?

One obvious response would be for party leaders to galvanize around a moderate establishment candidate — say, Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE if he runs — in hopes of heading off a diluted outcome or a left-wing winner.

Yet, recent history suggests that establishment candidates have fared very poorly for Democrats. Establishment figures Al Gore Albert (Al) Arnold GoreCruz says Senate Republicans likely have votes to confirm Trump Supreme Court nominee 4 inconclusive Electoral College results that challenged our democracy Fox's Napolitano: 2000 election will look like 'child's play' compared to 2020 legal battles MORE in 2000, 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 in 2004 and Hillary Clinton in 2008 and 2016 all went down in defeat.

Moreover, we are demonstrably in a populist age, one so anti-establishment that a president as unorthodox and norm-busting as Donald Trump could win an election and a self-described socialist like Bernie Sanders could nearly earn a nomination.

Instead of retreating to establishment figures, Democrats may want to look to other, more successful campaigns for the model of a fruitful primary process, especially the elections of 1992 and 2008.

In each, a relatively long primary process produced an anti-establishment figure (Bill Clinton William (Bill) Jefferson ClintonChelsea Clinton: Trump isn't building public confidence in a vaccine Hillary Clinton launching podcast this month GOP brushes back charges of hypocrisy in Supreme Court fight MORE, New Democrat; Barack Obama Barack Hussein ObamaMichelle Obama and Jennifer Lopez exchange Ginsburg memories Pence defends Trump's 'obligation' to nominate new Supreme Court justice The militia menace MORE, African-American) who carried the party to victory over primary and general election candidates viewed as more establishment.

In practical terms, what this means is that senior Democrats may want to resist the temptation to immediately flock to Biden or other establishment figures and instead see how they perform in the debates and early primaries.

It may turn out that a moderate other than Biden emerges, or that a more liberal candidate begins to attract widespread support from both moderates desperate to beat Trump as well as the left-wing base.

Letting the early primary process play out, at least until Super Tuesday, should provide a clear indication of which candidate will be strongest against Trump.

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But then, immediately after Super Tuesday, serious pressure should be brought to bear on candidates who cannot conceivably win the nomination to get out of the race.

While Democrats should embrace a large and diverse field of primary candidates as helping create a “big tent” Democratic coalition, they must also be clear-eyed about the dangers of dividing support among too many aspirants.

At some point next March, Democrats will need to start unifying behind a candidate who can beat Trump convincingly.

Paul Bledsoe is strategic advisor at the Progressive Policy Center. He served as a staff member in the House, Senate, Interior Department and Clinton White House.