The largest Democratic field in the modern US political era is lining up to seek the party's 2020 presidential nomination - and it is expected to keep growing.
Here is the list of the Democrats who have launched campaigns or are expected to pursue a presidential bid in the 2020 US election.
The senator from Vermont lost the Democratic nomination in 2016 to Hillary Clinton but has jumped in for a second try.
In the 2020 race, Sanders, 77, will have to fight to stand out in a packed field of progressives touting issues he brought into the Democratic Party mainstream four years ago.
His proposals include free tuition at public colleges, a $15 minimum wage and universal healthcare.
The leader in polls of Democratic presidential contenders is not even a candidate yet.
But Biden, who served eight years as vice president under President Barack Obama and 36 years in the US Senate, looks poised to join the 2020 race.
At 76, he would be the second oldest candidate in the Democratic nominating contests, after Senator Bernie Sanders.
Biden would be a key figure in the Democratic debate over whether a liberal political newcomer or a centrist veteran is needed to win back the White House.
The former three-term Texas congressman jumped into the race on March 14 - and has been jumping on to store countertops ever since to deliver his optimistic message to voters in early primary states.
O'Rourke, 46, gained fame last year for his record fundraising and ability to draw crowds ahead of his unexpectedly narrow loss in the US Senate race against Republican incumbent Ted Cruz.
The first-term senator from California would make history as the first black woman to gain the nomination.
Harris, 54, the daughter of immigrants from Jamaica and India, announced her candidacy on the holiday honouring slain civil rights leader Martin Luther King Jr.
She has made a quick impact in a Democratic race that will be heavily influenced by women and minority voters.
The 37-year-old mayor of South Bend, Indiana, is emerging from underdog status as he begins to build momentum with young voters.
A Harvard University graduate and Rhodes Scholar at the University of Oxford, he speaks seven languages and served in Afghanistan with the US Navy Reserve.
He touts himself as representing a new generation of leadership needed to combat Trump.
Buttigieg would be the first openly gay presidential nominee of a major American political party.
The 69-year-old senator from Massachusetts is a leader of the party’s liberals and a fierce Wall Street critic who was instrumental in creating the Consumer Financial Protection Bureau.
She has focussed her presidential campaign on her populist economic message, promising to fight what she calls a rigged economic system that favours the wealthy.
She also has proposed eliminating the Electoral College, vowed to break up Amazon, Google and Facebook.
Booker, 49, a senator from New Jersey and former mayor of Newark, gained national prominence in the fight over Brett Kavanaugh’s Supreme Court nomination.
Booker, who is black, has made US race relations and racial disparities a focus of his campaign, noting the impact of discrimination on his family.
He embraces progressive positions on Medicare coverage for every American, the Green New Deal and other key issues, and touts his style of positivity over attacks.
The third-term senator from Minnesota was the first moderate in the Democratic field vying to challenge Trump.
Klobuchar, 58, gained national attention in 2018 when she sparred with Brett Kavanaugh during Senate hearings for his Supreme Court nomination.
On the campaign trail, the former prosecutor and corporate attorney supports an alternative to traditional Medicare healthcare funding and is taking a hard stance against rising prescription drug prices.
The secretary of housing and urban development under President Barack Obama would be the first Hispanic to win a major US party's presidential nomination.
Castro, 44, whose grandmother was immigrated to Texas from Mexico, has used his family’s personal story to criticise Trump's border policies.
Castro advocates for a universal pre-kindergarten programme, supports Medicare for All and cites his experience to push for affordable housing.
The entrepreneur and former tech executive is focussing his campaign on an ambitious universal income plan.
Yang, 44, wants to guarantee all American citizens between the ages of 18 and 64 a $1,000 check every month.
The son of immigrants from Taiwan, Yang also is pushing for Medicare for All and proposing a new form of capitalism that is “human-centered.”
Gillibrand, known as a moderate when she served as a congresswoman from upstate New York, has refashioned herself into a staunch progressive, calling for strict gun laws and supporting the Green New Deal.
The senator for New York, who is 52, has led efforts to address sexual assault in the military and on college campuses, and she pushed for Congress to improve its own handling of sexual misconduct allegations.
On the campaign trail, she has made fiery denunciations of Trump.
The 67-year-old former Colorado governor has positioned himself as a centrist and an experienced officeholder with business experience.
He is the only Democratic presidential candidate so far to oppose the Green New Deal plan to tackle climate change, saying it would give the government too much power in investment decisions.
During his two terms in office, Colorado’s economy soared and the Western state expanded healthcare, passed a gun control law and legalized marijuana.
The Washington state governor has made fighting climate change the central issue of his campaign.
As governor, Inslee, 68, has moved to put a moratorium on capital punishment and fully implement the Affordable Care Act, commonly known as Obamacare, and accompanying expansion of Medicaid health coverage for the poor.
He has not settled on a position on Medicare for All but does support the Green New Deal backed by progressives.
The former US representative from Maryland became the first Democrat to enter the 2020 race, declaring his candidacy in July 2017.
Delaney, 55, plans to focus on advancing only bipartisan bills during the first 100 days of his presidency if elected.
He’s also pushing for a universal healthcare system, raising the federal minimum wage and passing gun safety legislation.
The Samoan-American congresswoman from Hawaii and Iraq war veteran is the first Hindu to serve in the US House of Representatives.
After working for her father’s anti-gay advocacy group and drafting relevant legislation, she was forced to apologise for her past views on same-sex marriage.
Gabbard, 37, has been against US intervention in Syria and slammed Trump for standing by Saudi Arabia after the murder of journalist Jamal Khashoggi.
The moderate nine-term congressman from a working-class district in the battleground state of Ohio has touted his appeal to the blue-collar voters who fled to Trump in 2016.
He says Trump has turned his back on those voters and failed to live up his promise to revitalise the manufacturing industry.
Ryan, 45, pledges to create jobs in new technologies and to focus on public education and access to affordable healthcare.
An Iraq War veteran and member of Congress, Seth Moulton, 40, was first elected to the US House of Representatives in 2014 when he defeated a fellow Democrat in the primary election.
Moulton served in the Marines from 2001 to 2008.
He became a vocal critic of the Iraq War in which he served, saying no more troops should be deployed to the country.
He has advocated stricter gun laws, saying military-style weapons should not be owned by civilians.
The 66-year-old New York Times best-selling author, motivational speaker and Texas native believes her spirituality-focused campaign can heal America.
A 1992 interview on Oprah Winfrey’s show propelled Williamson to make a name for herself as a “spiritual guide” for Hollywood and a self-help expert.
She is calling for $100 billion in reparations for slavery over 10 years, gun control, education reform and equal rights for lesbian and gay communities.
The list is in order of RealClearPolitics national polling average.