Three 2020 election polls by major news organizations were released Sunday, a year and one day (2020 is a leap year) before the 2020 presidential election and less than 100 days before the Iowa caucuses.

The big picture: The trio of polls — by Washington Post/ABC News, Fox News, and NBC News/Wall Street Journal — show a trio of Joe Biden, Sen. Elizabeth Warren and Sen. Bernie Sanders steadily pulling away from the pack. Mayor Pete Buttigieg, meanwhile, is consistently polling in a second tier by himself, while the rest of the field occupies the low single digits.

What to watch: To qualify for the Dec. 19 debate hosted by Politico and PBS NewsHour, candidates need to hit 4% in four DNC-approved polls (or 6% in two DNC-approved early state polls) and receive donations from 200,000 unique contributors.

With Sunday's polls, Biden, Warren, Sanders, Buttigieg and Sen. Kamala Harris have qualified for the debate.

Sen. Amy Klobuchar got closer to qualifying for the debate after hitting 5% in the NBC/WSJ poll, her third qualifying poll. Klobuchar’s campaign has said she has already crossed the donor threshold.

By the numbers

Washington Post/ABC News poll:

Joe Biden: 27%

Elizabeth Warren: 21%

Bernie Sanders: 19%

Pete Buttigieg: 7%

Cory Booker: 2%

Julián Castro: 2%

Tulsi Gabbard: 2%

Kamala Harris: 2%

Andrew Yang: 2%

Michael Bennet: 1%

John Delaney: 1%

Amy Klobuchar: 1%

Tom Steyer: 1%

Fox News poll:

Joe Biden: 31%

Elizabeth Warren: 21%

Bernie Sanders: 19%

Pete Buttigieg: 7%

Kamala Harris: 3%

Andrew Yang: 3%

Cory Booker: 2%

Tulsi Gabbard: 2%

Amy Klobuchar: 2%

Tom Steyer: 1%

Wall Street Journal/NBC News poll:

Joe Biden: 27%

Elizabeth Warren: 23%

Bernie Sanders: 19%

Pete Buttigieg: 6%

Amy Klobuchar: 5%

Kamala Harris: 4%

Andrew Yang: 3%

Cory Booker: 2%

Tulsi Gabbard: 2%

Julián Castro: 1%

Michael Bennet: 1%

Methodologies

Washington Post/ABC News poll: This poll was conducted between Oct. 27–30 among a random national sample of U.S. adults reached on cellphones and landlines. The margin of sampling error is ±5.5 percentage points among the sample of 452 Democrats and Democratic-leaning independent adults, and is ±6 points among the sample of 402 Democratic-leaning registered voters.

Fox News poll: This poll was conducted between Oct 27–30 under the joint direction of Beacon Research (D) and Shaw & Company (R). It includes interviews with 1,040 randomly chosen registered voters nationwide who spoke with live interviewers on both landlines and cellphones. The poll has a margin of sampling error of ±3 percentage points for all registered voters and 4.5 points for Democratic primary voters (471).

Wall Street Journal/NBC News poll: This poll was conducted between Oct. 27–30 among 900 adults, including 495 respondents with a cellphone only. The margin of error for 900 interviews among adults is ±3.27%. The margin of error for 720 interviews among registered voters is ±3.65%. The margin of error for 414 interviews among Democratic primary voters is ±4.82%.

Go deeper: How to read 2020 election polls