Reuters

The Democratic field for the 2020 U.S. presidential race emerged as the biggest and most diverse of any party primary in recent history. With over 20 candidates at the field’s peak, it was hard for many months to keep track of who was in the running. Here is a breakdown of all the Democratic contenders and a running list of those who have already ended their quests. This is a brief look at candidates’ backgrounds and stated proposals, and is not meant to be comprehensive. We urge readers to further explore the candidates at length. Our list will be updated regularly as the party heads toward its July 13-16 national convention in Milwaukee, so check back to see how the Democratic field shifts. Who’s In The Running: Former Vice President Joe Biden

AP Photo/Matt Rourke Joe Biden has declared himself “the most qualified person” to be president.

Biden announced his candidacy in April 2019 after months of speculation. He steadily led the race for the Democratic nomination in early polling, even as several women accused him of inappropriate and unwanted touching. Biden has also faced renewed criticism over his handling of Anita Hill’s sexual harassment allegations against Supreme Court Justice Clarence Thomas in 1991 when Biden was Senate Judiciary Committee chair. Despite the controversies, Biden has declared himself “the most qualified person” to be president. He served for 36 years in the Senate and eight years as vice president under President Barack Obama. Biden lists tackling income inequality, defending the Affordable Care Act and pursuing a “humane immigration policy” as some of his platform proposals. Rep. Tulsi Gabbard (Hawaii)

AP Photo/John Locher Tulsi Gabbard has pointed to “the issue of war and peace” as a motivation behind her decision to run.

Gabbard became the first Samoan American and first Hindu member of Congress when she was elected to the House of Representatives in 2013. She previously served in the Hawaii House of Representatives and on the Honolulu City Council. During that time, she also enlisted in the Hawaii Army National Guard and was deployed to Iraq from 2004 to 2005 and to Kuwait from 2008 to 2009. The four-term congresswoman, who has been criticized for receiving campaign donations from arms dealers, has pointed to “the issue of war andpeace” as motivation for her decision to run. Other policy positions Gabbard noted upon announcing her campaign included supporting “Medicare for All,” criminal justice reform and environmental advocacy. Sen. Bernie Sanders (I-Vt.)

AP Photo/Cliff Owen Bernie Sanders has promised his second presidential bid would be a “continuation of what we did in 2016.”

Sanders announced in February 2019 that he would make another bid for the White House after losing the Democratic nomination in 2016 to Hillary Clinton. The independent senator from Vermont promised his second presidential bid would be a “continuation of what we did in 2016,” noting that many of the progressive policy proposals from his campaign “are now part of the political mainstream.” An independent who caucuses with the Democrats, Sanders has long been considered one of the most progressive members of the Senate. His platform calls for “Medicare for All” and a $15 minimum wage. He also advocates for free college tuition, lowering the costs of prescription drugs and passing the Green New Deal to combat climate change. Who’s Dropped Out Sen. Elizabeth Warren (Mass.)

MANDEL NGAN/AFP/Getty Images Sen. Elizabeth Warren (D-Mass.) positioned herself as a champion for the middle class.

Andrew Kelly / Reuters Mike Bloomberg delivering remarks while being honored by the Iron Hills Civic Association at the Richmond County Country Club in Staten Island, New York, on Dec. 4, 2019.

The billionaire businessman suspended his campaign and endorsed Biden after a paltry performance on Super Tuesday, in which he won only the American Samoa caucuses. He officially entered the 2020 presidential race in late November, joining a large cohort of Democrats already competing for the party’s nomination. Bloomberg said in his announcement that he believed his experience “in business, government, and philanthropy will enable me to win and lead.” A longtime registered Republican, Bloomberg has been an outspoken critic of Trump since the 2016 presidential election. He re-registered as a Democrat in October 2018, almost 20 years after he left the party. Bloomberg served three terms as mayor of New York City with a mixed legacy that included erasing the city’s budget deficit and instituting the controversial “stop-and-frisk” police initiative, which disproportionately affected the city’s people of color. Sen. Amy Klobuchar (Minn.)

AP Photo/Darren Hauck Sen. Amy Klobuchar (D-Minn.) speaking during a Fox News Channel town hall meeting on May 8, 2019, in Milwaukee.

AP Photo/Lynne Sladky Pete Buttigieg, then the mayor of South Bend, Indiana, speaks during a fundraiser at the Wynwood Walls on May 20, 2019, in Miami.

After two successful primary contests in Iowa and New Hampshire, Buttigieg dropped out of the race the day after the South Carolina primary, where fellow moderate Biden won in a landslide. A military veteran and former Rhodes scholar, Buttigieg served as the mayor of South Bend, Indiana, from 2012 to the end of 2019. He is openly gay and devoutly Christian and has admonished Vice President Mike Pence and other evangelicals for backing Trump. Though largely unknown outside of South Bend before 2019, Buttigieg captured national attention and raked in millions of dollars in donations. The former mayor was running on a platform that highlighted defending LGBTQ rights, combating climate change with a Green New Deal, protecting reproductive rights and investing in veterans’ mental health. Hedge fund manager Tom Steyer

Steven Senne/Associated Press Tom Steyer spent more than $120 million on his Need to Impeach effort and signed up more than 6 million people.

Steyer dropped out of the race after Biden secured a victory in the South Carolina primary, days before Super Tuesday. Steyer told his supporters that he was suspending his campaign because he could not see a “path to winning.” “I was in this race to talk about things that I care the most about,” Steyer said, nodding to his efforts to address racial injustice and climate change. He also said any Democrat in the race would be better than the current administration. “Every Democrat is a million times better than Trump,” he said. “Lindsey Graham’s a disaster. He’s a disaster for the people here.” Steyer, a billionaire, is the largest individual donor in Democratic politics. After telling Politico in January 2019 that he would not run ― instead focusing on his multimillion-dollar effort to impeach Trump ― Steyer announced in July that he’d changed his mind. He had previously said he was content with the landscape of candidates challenging the president, particularly Sen. Elizabeth Warren for her economic message and Washington Gov. Jay Inslee for his environmental one. But he believed he could do better, The Atlantic reported. In particular, the outlet noted, Steyer said he could challenge Trump on his image as a self-made businessman. Former Massachusetts Gov. Deval Patrick

ASSOCIATED PRESS Gov. Deval Patrick gestures during a news conference at the Massachusetts State House in Boston on Jan. 22, 2014.

Patrick, a former two-term Massachusetts governor, dropped out the day after he failed to break the 1% mark in the New Hampshire primary. “The vote in New Hampshire last night was not enough for us to create the practical wind at the campaign’s back to go on to the next round of voting. So I have decided to suspend the campaign, effective immediately,” he said in a statement. Patrick entered the field late in the process, announcing his candidacy on Nov. 14, just one day before the filing deadline for the New Hampshire primary. Anonymous sources told both The Associated Press and The New York Times that Patrick was concerned the existing Democratic presidential candidates weren’t capable of uniting the party in a bid to unseat President Donald Trump. The 63-year-old currently works as a managing director at Bain Capital. Patrick previously declared he wouldn’t seek the presidency. He told CBS he reversed course because “you can’t know if you can break through if you don’t get out there and try.” Businessman Andrew Yang

Phil Long/Associated Press Andrew Yang has proposed a $1,000-a-month stipend for all U.S. citizens.

Yang ended his campaign as the first Democratic primary in the country came to close in New Hampshire in February 2020. “I am so incredibly proud of this campaign and what we’ve accomplished together,” Yang told his reporters on the night of the primary in Manchester. “We have touched and improved millions of lives and moved this country we love so much in the right direction. And while there is great work left to be done — you know I am the math guy — it is clear tonight from the numbers that we are not going to win this race.” The entrepreneur vowed to support the candidate who won the Democratic nomination, but warned that Trump wasn’t the main problem in the U.S. Yang is a businessman and philanthropist who founded Venture for America, a nonprofit fellowship program that places recent graduates in two-year apprenticeships with startups. The successful tech entrepreneur is running on a platform of universal basic income with the tagline “let’s put humanity first.” He has proposed a $1,000-a-month stipend for all U.S. citizens to help ease financial anxiety for the underemployed as the economy moves increasingly toward automation. He is also a proponent of universal Medicare and statehood for Puerto Rico. Sen. Michael Bennet (Colo.)

ASSOCIATED PRESS Michael Bennet is a senator from Colorado and former head of the Denver school district.

Bennet also ended his campaign after the polls closed for the New Hampshire Democratic primary in February 2020. “I am going to do absolutely everything I can do as one human being to make sure that Donald Trump is a one-term president,” Bennet told his supporters as the polls closed. “I will support the nominee of my party no matter who it is.” Bennet’s campaign plans were initially thwarted when he was diagnosed with prostate cancer. But the three-term senator announced his presidential run in May 2019 after his office said he was successfully treated. A former head of the Denver school district, Bennet gained internet fame in January 2019 for his harsh scolding of Sen. Ted Cruz (R-Texas) over the government shutdown. The Colorado senator said he will focus on increasing wages, protecting young undocumented immigrants and overturning the Supreme Court’s Citizens United decision, among other platform initiatives. Sen. Cory Booker (N.J.)

AP Photo/Jae C. Hong Cory Booker made criminal justice reform a central focus of his campaign.

Booker suspended his campaign in mid-January, saying he no longer saw a path to his victory. “Our campaign has reached the point where we need more money to scale up and continue building a campaign that can win ― money we don’t have, and money that is harder to raise because I won’t be on the next debate stage and because the urgent business of impeachment will rightly be keeping me in Washington,” Booker wrote in an email to supporters. He was first elected to the Senate in 2013, becoming the first Black U.S. senator from New Jersey. Booker had previously served two terms as mayor of Newark. The junior senator is on the Judiciary Committee and gained national prominence for his tough questioning in Senate hearings, including during the 2018 confirmation hearing for now-Supreme Court Justice Brett Kavanaugh. Author Marianne Williamson

Amy Harris/Invision/AP Marianne Williamson pledged to “forge a new, whole-person, heart-centered political dynamic.”

Williamson dropped out of the race on Jan. 10, 2020, saying she didn’t want her campaign to diminish the success of other progressive candidates leading the polls in early states. “I stayed in the race to take advantage of every possible effort to share our message,” she said. “With caucuses and primaries now about to begin, however, we will not be able to garner enough votes in the election to elevate our conversation any more than it is now.” Touted as Oprah’s spiritual adviser, Williamson is probably best known for her popular self-help books and spiritually themed talks. She ran an unsuccessful campaign for Congress in 2014 and has repeatedly spoken out against the Trump administration and what she deems the “spiritual and moral rot” in Washington. Former West Virginia state Sen. Richard Ojeda

John Sommers II/Getty Images Richard Ojeda said he couldn’t in good conscience ask people to donate “to a campaign that’s probably not gonna get off the ground.”

Ojeda announced he was folding his campaign less than two weeks after he vacated his West Virginia state Senate seat to run. He was the first Democratic candidate to drop out of the race. An Army veteran and pro-coal populist Democrat, Ojeda announced his presidential run in November 2018 after losing a congressional race against Republican Carol Miller. But in January 2019, the former state senator said he couldn’t in good conscience ask people to donate “to a campaign that’s probably not gonna get off the ground.” Rep. Eric Swalwell (Calif.)

mpi04/MediaPunch/IPx Rep. Eric Swalwell is shifting his focus to running for reelection to the House.

After a three-month campaign that failed to gain traction, Swalwell announced in July last year that he was exiting the presidential race and shifting his focus to running for reelection to the House. Swalwell was first elected to the U.S. House of Representatives in 2013, and before that, served for three years on the city council of Dublin, California. The congressman launched his presidential campaign in April 2019. Swalwell focused on gun violence during his brief run and was the only candidate to favor buybacks of assault weapons. Former Sen. Mike Gravel (Alaska)

Brian Snyder / Reuters Mike Gravel initially said he was running to push the Democratic field to the left.

Gravel dropped out of the race in early August 2019 and endorsed Sen. Bernie Sanders and Rep. Tulsi Gabbard. Perhaps best known for reading the Pentagon Papers into the Congressional Record, Gravel said he had hoped to push the Democratic field to the left. But the former Alaska senator’s campaign was unorthodox from the start. His 17-year-old campaign manager at one point insisted “the senator does not want people to vote for him.” Former Colorado Gov. John Hickenlooper

AP Photo/Charlie Neibergall Former Colorado Gov. John Hickenlooper appeared unlikely to qualify for the September primary debate.

A self-proclaimed moderate Democrat, Hickenlooper folded his campaign in mid-August 2019 after participating in two Democratic primary debates over the summer. “Today, I’m ending my campaign for president,” he said in a videotaped statement on Aug. 15. “But I will never stop believing that America can only move forward when we work together. The announcement came as the former Colorado governor appeared unlikely to qualify for the September primary debate. Hickenlooper did not immediately announce his plans, but he said he would give thought to a run for Senate in 2020 against Sen. Cory Gardner (R). Washington Gov. Jay Inslee

Photo by Stephen Maturen/Getty Images Jay Inslee ran the first major presidential campaign centered entirely on combating climate change.

Inslee dropped out of the race on Aug. 21 last year, as he looked unlikely to qualify for the September debates. “It’s become clear that I’m not going to be carrying the ball, I’m not going to be the president, so I’m withdrawing tonight from the race,” he told MSNBC’s Rachel Maddow. The Washington governor ran the first major presidential campaign centered entirely on combating climate change. Inslee had proposed a “massive, full-scale mobilization of our federal government” toward “100% clean energy” that would involve investing in renewable energy, creating zero-emissions standards for cars and buildings, and working toward carbon-neutral energy. “Look, I’ve been fighting climate change for 25 years, and I’ve never been so confident of the ability of America now to reach critical mass to move the ball,” Inslee told Maddow. “I believe we are going to have a candidate to fight this battle and inspire the people I met across the country.” Rep. Seth Moulton (Mass.)

AP Photo/Cheryl Senter Seth Moulton said during his presidential run that he would seek to grant statehood to Puerto Rico and Washington, D.C.

Moulton dropped out of the race on Aug. 23, 2019, saying he would instead run for reelection to Congress and campaign his “ass off for whoever wins our nomination in 2020.” “Today, I want to use this opportunity, with all of you here, to announce that I am ending my campaign for president,” he said in a prepared statement. “Though this campaign is not ending the way we hoped, I am leaving this race knowing that we raised issues that are vitally important to the American people and our future.” Moulton, an Iraq War veteran, was first elected to Congress in 2014. The congressman led an unsuccessful effort to remove Rep. Nancy Pelosi (D-Calif.) as House speaker in 2018 after Democrats took control of the U.S. House of Representatives. Moulton advocated for stricter gun laws, including banning civilians from owning military-style weapons. The congressman also supports the legalization of cannabis, enacting the Green New Deal and protecting voting rights. He has said he would seek to grant statehood to Puerto Rico and Washington, D.C. Sen. Kirsten Gillibrand (N.Y.)

JIM WATSON/AFP/Getty Images Sen. Kirsten Gillibrand highlighted her anti-Trump record and past political advocacy and legislation in her run for president.

Gillibrand exited the race on Aug. 28, 2019, after failing to qualify for the September debate. “It’s important to know when it’s not your time and to know how you can best serve your community and country,” she said in a video. “I believe I can best serve by helping to unite us to beat Donald Trump in 2020.” The New York senator and former attorney framed her campaign as a fight to return to “America’s values,” highlighting her anti-Trump record and past political advocacy and legislation. She spotlighted her pro-bono law work for women and children and said she would work toward affordable child care, defend abortion rights and curb gun violence. New York City Mayor Bill de Blasio

Yana Paskova via Getty Images New York Mayor Bill de Blasio, standing alongside his wife Chirlane McCray, announced his decision to drop out of the 2020 presidential race.

De Blasio dropped out of the race on Sept. 20, 2019, saying, “It’s clearly not my time.” The New York City mayor had joined an already-crowded Democratic field in May and failed to gain traction as a candidate. Upon exiting the race, de Blasio said he would support whoever becomes the Democratic nominee. But he added: “I do believe we need a progressive.” Rep. Tim Ryan (Ohio)

Caroline Brehman via Getty Images Ryan dropped out of the race in October after failing to qualify for two debates in a row.

Ryan suspended his presidential campaign in October last year, shortly after he did not qualify for the primary debate on Oct. 15. “I got into this race in April to really give voice to the forgotten people of our country. I look forward to continuing that fight,” the Ohio congressman said in a Twitter announcement. Ryan also didn’t make the cut for the September debate, as he struggled to gain traction in a Democratic field of over 20 candidates. The congressman announced his bid for the White House in April, citing acrimonious partisanship and the decline of American manufacturing among his reasons to run. Former Rep. Beto O’Rourke (Texas)

Mike Blake / Reuters Beto O'Rourke takes part in a televised town hall on CNN dedicated to LGBTQ issues in Los Angeles on Oct. 10, 2019.

O’Rourke dropped out of the race in early November as his polling numbers and fundraising dwindled in a crowded Democratic field. He endorsed Biden a day before Super Tuesday. In a blog post explaining his decision, the former Texas congressman said dropping out was “in the best interests of this party as we seek to unify around a nominee; and it is in the best interests of the country.” O’Rourke gained prominence with an underdog U.S. Senate race in 2018 that ended in his defeat against incumbent Sen. Ted Cruz. He had previously served in the House since 2013. O’Rourke touted his fierce criticism of the war on drugs and support for the Dream Act and pathways to citizenship for undocumented immigrants. Miramar, Florida, Mayor Wayne Messam

Joe Raedle via Getty Images Mayor Wayne Messam speaks at a rally at Florida Memorial University in Miami Gardens.

Messam withdrew from the race on Nov. 19, citing his campaign’s struggle to gain traction when there was not much media coverage and his political rivals’ comparatively easy access to campaign cash. Messam launched his campaign in March, saying he believed he was the best Democratic candidate to beat Trump because “mayors get the job done.” Messam was elected mayor of Miramar, located about 20 miles north of Miami, in 2015. He previously served on the city commission, and before that, started a “climate-conscious” construction company with his wife Angela. The mayor highlighted eliminating student loan debt as one of his top priorities, along with strengthening gun control laws and repealing tax breaks for the wealthiest Americans. Former Rep. Joe Sestak (Pa.)

Bill Clark/CQ Roll Call Joe Sestak served in the Navy for roughly three decades.

Sestak withdrew from the 2020 presidential race on Dec. 1 after failing to qualify for any of the Democratic debates. The three-star admiral announced his decision in an email, telling supporters that he couldn’t fairly continue to seek contributions for a campaign that hasn’t shown viability. “Without the privilege of national press, it is unfair to ask others to husband their resolve and to sacrifice resources any longer,” he said. Sestak was first elected to the U.S. House of Representatives in a Republican-dominated district in 2006, and he served two terms. He held positions on the Armed Services Committee and the Education and Labor Committee, and served as vice chairman of the Small Business Committee. He was the director of defense policy on the National Security Council under President Bill Clinton in the mid-1990s, and before that, he spent roughly three decades in the Navy. Montana Gov. Steve Bullock

Thom Bridge/Independent Record via AP Steve Bullock was the only Democratic candidate who won a statewide office in a state that went for Trump in 2016.

Bullock dropped out of the race in early December after his campaign, which emphasized limiting the influence of money in politics, failed to gain traction. Bullock was the lone Democratic candidate who had won a statewide office in a state that voted for Trump in 2016, a fact he used to argue that he could win over Republican voters to defeat Trump in 2020. “I entered this race as a voice to win back the places we lost, bridge divides and rid our system of the corrupting influence of Dark Money,” Bullock said in a statement. “While the concerns that propelled me to enter in the first place have not changed, I leave this race filled with gratitude and optimism, inspired and energized by the good people I’ve had the privilege of meeting over the course of the campaign.” The two-term governor added that he would not run for U.S. Senate against GOP Sen. Steve Daines. Senate Democrats had hoped to recruit Bullock into that race. Sen. Kamala Harris (Calif.)

NICHOLAS KAMM via Getty Images Sen. Kamala Harris speaks to the press after participating in the fifth Democratic primary debate in Atlanta on Nov. 20, 2019.

AP Photo/Richard W. Rodriguez Julián Castro said his first action in office would be signing an executive order recommitting the U.S. to the Paris climate agreement.

Castro bowed out of the race in early January 2020, barely a month before the Iowa caucuses. The former secretary of housing and urban development and mayor of San Antonio, Texas, was the only Latino candidate running, a point he emphasized in a video announcing his withdrawal. “What we’re staring at is a DNC debate stage with no people of color on it,” Castro said in a filmed statement. “That does not reflect the diversity of our party or our country. We need to do better than that.” Castro’s proposed “People First” platform emphasized law enforcement reform with a focus on policing and immigration, in addition to a plan for education. As a descendant of Mexican immigrants, Castro distinguished himself from the Democratic field by committing to overhauling the immigration process, including decriminalizing unauthorized border crossing. The candidate also pledged to recommit the U.S. to the Paris climate agreement as his first action in office. Former Rep. John Delaney (Md.)

AP Photo/Nati Harnik Democratic presidential candidate and former Rep. John Delaney (D-Md.) speaks at the Heartland Forum held on the campus of Buena Vista University in Storm Lake, Iowa, on March 30, 2019.