The bloated Democratic primary field is quickly narrowing down, and the inevitable spate of dropouts will likely benefit the top-tier of the field and enable them to consolidate more support.

In the past month alone, five candidates called it quits after failing to meet the stricter requirements to qualify for the September and October DNC debates.

To help make sense of where all these candidates stand relative to eachother, Insider has been conducting a recurring SurveyMonkey Audience national poll.

Here's a look at which top-tier Democratic candidates will benefit the most from 13 lower and mid-tier contenders dropping out, according to Insider polling.

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The bloated Democratic primary field is quickly narrowing down, and the inevitable spate of dropouts will likely benefit the top-tier of the field and enable them to consolidate more support.

In the past month alone, five lower-tier candidates called it quits after failing to meet the stricter requirements to qualify for the September and October DNC debates, which required candidates to earn 130,000 individual donors and reach 2% in four DNC-approved polls.

Former Gov. John Hickenlooper dropped out to run for US Senate in Colorado, Gov. Jay Inslee quit the race to run for a third term as governor of Washington, and Rep. Seth Moulton also left the race to run for re-election in Massachusetts.

Two of the three New York elected officials originally in the primary have also dropped out. Sen. Kirsten Gillibrand ended her campaign in late August after failing to crack 2% in the polls or qualify for the September debate, and Mayor Bill de Blasio did the same on September 20.

Former Vice President Joe Biden is set to gain from de Blasio dropping out since about three-quarters of de Blasio supporters like Biden, which is considerably higher than Biden's performance among the entire Democratic primary electorate.

Read more: Bill de Blasio drops out of 2020 race, after languishing for months behind Democratic rivals

To help make sense of where all these candidates stand relative to eachother, Insider has been conducting a recurring SurveyMonkey Audience national poll. (Read more about how the Insider 2020 Democratic primary tracker works here).

At this point in the race, we're mainly interested in using our polling to figure out:

What percentage of Democratic voters are familiar with each candidate in the first place.

How Democrats rate each candidate's chances of beating President Donald Trump in the general election.

If a given candidate were to drop out of the race, who that candidate's supporters would flock to next.

Here's a look at which top-tier Democratic candidates will benefit the most from 13 lower and mid-tier contenders dropping out, according to Insider polling.