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(CNN) —  

The 2020 Democratic presidential primary field is down to one. Sen. Bernie Sanders has ended his presidential campaign, leaving only former Vice President Joe Biden remaining from the once-crowded pack.

Here’s an updated look at all the candidates who were once in the race.

For the latest 2020 election news, check out CNN’s full coverage.

Announced campaigns

Former Vice President Joe Biden

AGE: 77

STATE: Delaware

KNOWN FOR: Biden’s long-anticipated announcement marks his third presidential campaign after he passed on a 2016 run. His name recognition, decades of experience and ties to former President Barack Obama are seen as his greatest assets. But his track record on – and public response to – making some women uncomfortable with his behavior could be an obstacle to gaining modern voters, some of whom may also think that the party needs new, more diverse representation.

00:56 - Source: CNN
Bernie Sanders announces 2020 presidential run

Dropped out

Sen. Michael Bennet

AGE: 55

STATE: Colorado (Dropped out February 11, 2020)

KNOWN FOR: Bennet, the former superintendent of Denver Public Schools, was forced to hold off on entering the race following a diagnosis and subsequent treatment of prostate cancer in April. Having served in the Senate since 2009, Bennet pitched himself in pre-campaign appearances and speeches as a pragmatic lawmaker who has a progressive voting record. Bennet’s candidacy sputtered from the outset, with the Colorado senator failing to qualify for the majority of Democratic debates or to gain traction among voters in key states.

01:58 - Source: CNN
Sen. Michael Bennet jumps in 2020 presidential race

Former New York Mayor Michael Bloomberg

AGE: 77

STATE: New York (Dropped out on March 4, 2020)

KNOWN FOR: The former New York mayor entered the race in late November as a moderate alternative to Biden, highlighting his extensive experience as NYC’s mayor and the campaign funds he put toward key Democratic issues such as the climate crisis and gun control in past elections. His campaign briefly gained traction amid Biden’s early struggles, but he faltered after widely criticized debate performances and questions over his past support for stop-and-frisk policing practices. He dropped out after he only won the American Samoa in the critical Super Tuesday contests.

01:47 - Source: CNN
Michael Bloomberg: From entrepreneur to politician

Sen. Cory Booker

AGE: 50

STATE: New Jersey (Dropped out January 13, 2020)

KNOWN FOR: Booker, who gained national recognition during his tenure as Newark’s mayor before being elected to the US Senate, ran for president aiming to restore a sense of community and mend the moral fabric of America. But his fundraising paled in comparison to that of the top-tier Democratic candidates, limiting his capacity to expand his campaign team and advertise on television.

01:18 - Source: CNN
Who is Cory Booker?

Gov. Steve Bullock

AGE: 53

STATE: Montana (Dropped out December 2, 2019)

KNOWN FOR: Bullock, who served as Montana’s attorney general before being elected governor in 2012, failed to convince the party’s base that the best way to defeat Trump was by nominating someone who can win in a red state. Bullock, who is term-limited as governor, will not take on Republican Sen. Steve Daines in 2020, his spokeswoman said.

01:56 - Source: CNN
Montana Governor Steve Bullock announces 2020 run

Former South Bend, Indiana, Mayor Pete Buttigieg

AGE: 38

STATE: Indiana

KNOWN FOR: Known locally in South Bend, Indiana, as “Mayor Pete,” Buttigieg served as a naval officer in Afghanistan. Buttigieg’s run was historic. He is the first openly gay man to launch a competitive campaign for president, and he broke barriers by becoming the first gay candidate to earn primary delegates for a major party’s presidential nomination. He ended his campaign on March 1, 2020 after his performances in Nevada and South Carolina, two states where Buttigieg finished significantly behind the race’s front-runners.

Former Secretary of Housing and Urban Development Julián Castro

AGE: 45

STATE: Texas (Dropped out January 2, 2019)

KNOWN FOR: The son of a Chicana activist, Castro served as mayor of San Antonio in 2009 and served as secretary of Housing and Urban Development in the Obama administration. The only Latino in the 2020 field, Castro ran an unabashedly progressive campaign over the last year, staking out left positions on issues like immigration, housing and policing. But the former secretary failed to gain traction in the large field of Democratic candidates and struggled to raise enough money to stay solvent.

01:10 - Source: CNN
Julián Castro could be the only Hispanic 2020 candidate

New York Mayor Bill de Blasio

AGE: 58

STATE: New York (dropped out September 20, 2019)

KNOWN FOR: The two-term New York mayor has enjoyed success on several largely progressive issues such as universal pre-K, raising the minimum wage and a low murder rate during his tenure. But he failed to resonate in the polls and was criticized for neglecting his duties as mayor to run for president, most notably during a brief blackout in Manhattan in July which happened when he was campaigning in Iowa.