The most diverse group of politicians to ever run for the White House emerged during the 2020 Democratic primaries, as Donald Trump seeks re-election — and has since winnowed to another all-white race featuring senators, former lawmakers and multiple billionaires.

With the first-in-the-nation caucus and primary both out of the way, a variety of candidates have proven to be fundraising juggernauts, while others have been forced to suspend their presidential campaigns.

As the list of Democrats running for the Oval Office has been rather difficult to keep up with this year, here are each of the 2020 hopefuls who are still in the race.

Meet the candidates

Joe Biden

Former US vice president Joe Biden officially joined the Democratic presidential contest to replace Donald Trump in 2020, immediately becoming an instant frontrunner alongside Bernie Sanders, who then went on to have much stronger performances in the Iowa caucus and New Hampshire primary.

In his campaign video, Mr Biden warned that handing Mr Trump a further four years in the White House would “forever and fundamentally alter the character of this nation”.

He has been forced to address the issue of his age – at 76, Mr Biden is four years older than Mr Trump – suggesting he’s “the most qualified person” to run against the president in 2020.

He also attacked the president for his response to a white supremacist rally in Charlottesville, Virginia, in 2017, accusing Mr Trump of having “assigned moral equivalence between those spreading hate and those with the courage to stand against it”.

“In that moment, I knew that the threat to this nation was unlike any I had ever seen in my lifetime,” he added.

The Democrat challengers to Trump in 2020 Show all 25 1 /25 The Democrat challengers to Trump in 2020 The Democrat challengers to Trump in 2020 Bernie Sanders The Vermont senator has launched a second bid for president after losing out to Hilary Clinton in the 2016 Democratic primaries. He is running on a similar platform of democratic socialist reform Getty The Democrat challengers to Trump in 2020 Joe Biden The former vice president recently faced scrutiny for inappropriate touching of women, but was thought to deal with the criticism well and has since maintained a front runner status in national polling EPA The Democrat challengers to Trump in 2020 Elizabeth Warren The Massachusetts senator is a progressive Democrat, and a major supporter of regulating Wall Street Reuters The Democrat challengers to Trump in 2020 Amy Klobuchar Klobuchar is a Minnesota senator who earned praise for her contribution to the Brett Kavanaugh hearings Getty The Democrat challengers to Trump in 2020 Michael Bloomberg Michael Bloomberg, a late addition to the 2020 race, announced his candidacy after months of speculation in November. He has launched a massive ad-buying campaign and issued an apology for the controversial "stop and frisk" programme that adversely impacted minority communities in New York City when he was mayor Getty Images The Democrat challengers to Trump in 2020 Tulsi Gabbard The Hawaii congresswoman announced her candidacy in January, but has faced tough questions on her past comments on LGBT+ rights and her stance on Syrian President Bashar al-Assad Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Pete Buttigieg The centrist Indiana mayor and war veteran would be the first openly LGBT+ president in American history Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Deval Patrick The former Massachusetts governor launched a late 2020 candidacy and received very little reception. With just a few short months until the first voters flock to the polls, the former governor is running as a centrist and believes he can unite the party's various voting blocs AFP/Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Beto O'Rourke The former Texas congressman formally launched his bid for the presidency in March. He ran on a progressive platform, stating that the US is driven by "gross differences in opportunity and outcome" AP The Democrat challengers to Trump in 2020 DROPPED OUT: Kamala Harris The former California attorney general was introduced to the national stage during Jeff Sessions’ testimony. She has endorsed Medicare-for-all and proposed a major tax-credit for the middle class AFP/Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Bill De Blasio The New York mayor announced his bid on 16 May 2019. He emerged in 2013 as a leading voice in the left wing of his party but struggled to build a national profile and has suffered a number of political setbacks in his time as mayor AFP/Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Steve Bullock The Montana governor announced his bid on 14 May. He stated "We need to defeat Donald Trump in 2020 and defeat the corrupt system that lets campaign money drown out the people's voice, so we can finally make good on the promise of a fair shot for everyone." He also highlighted the fact that he won the governor's seat in a red [Republican] state Reuters The Democrat challengers to Trump in 2020 DROPPED OUT: Cory Booker The New Jersey Senator has focused on restoring kindness and civility in American politics throughout his campaign, though he has failed to secure the same level of support and fundraising as several other senators running for the White House in 2020 Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Wayne Messam Mayor of the city of Miramar in the Miami metropolitan area, Wayne Messam said he intended to run on a progressive platform against the "broken" federal government. He favours gun regulations and was a signatory to a letter from some 400 mayors condemning President Trump's withdrawal from the Paris Climate Accord Vice News The Democrat challengers to Trump in 2020 DROPPED OUT: Kirsten Gillibrand The New York Senator formally announced her presidential bid in January, saying that “healthcare should be a right, not a privilege” Getty The Democrat challengers to Trump in 2020 DROPPED OUT: John Delaney The Maryland congressman was the first to launch his bid for presidency, making the announcement in 2017 AP The Democrat challengers to Trump in 2020 DROPPED OUT: Andrew Yang The entrepreneur announced his presidential candidacy by pledging that he would introduce a universal basic income of $1,000 a month to every American over the age of 18 Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Julian Castro The former San Antonio mayor announced his candidacy in January and said that his running has a “special meaning” for the Latino community in the US Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Marianne Williamson The author and spiritual adviser has announced her intention to run for president. She had previously run for congress as an independent in 2014 but was unsuccessful Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Eric Swalwell One of the younger candidates, Swalwell has served on multiple committees in the House of Representatives. He intended to make gun control central to his campaign but dropped out after his team said it was clear there was no path to victory Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Seth Moulton A Massachusetts congressman, Moulton is a former US soldier who is best known for trying to stop Nancy Pelosi from becoming speaker of the house. He dropped out of the race after not polling well in key states Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Jay Inslee Inslee has been governor of Washington since 2013. His bid was centred around climate change AFP/Getty The Democrat challengers to Trump in 2020 DROPPED OUT: John Hickenlooper The former governor of Colorado aimed to sell himself as an effective leader who was open to compromise, but failed to make a splash on the national stage Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Tim Ryan Ohio representative Tim Ryan ran on a campaign that hinged on his working class roots, though his messaging did not appear to resonate with voters Getty The Democrat challengers to Trump in 2020 DROPPED OUT: Tom Steyer Democratic presidential hopeful billionaire and philanthropist Tom Steyer is a longtime Democratic donor AFP/Getty

Bernie Sanders

A favourite among progressive voters during the 2016 election, the lifelong Independent senator from Vermont was bested by Ms Clinton despite some polls at the time indicating he may have been the best bet for the Democratic Party to defeat Mr Trump in the general election.

Now, the 77-year-old has announced a run again in 2020 – calling out the president as “a pathological liar” and offering a robust policy platform. “I am asking you to join me today as part of an unprecedented and historic grassroots campaign that will begin with at least a million people from across the country,” Mr Sanders wrote in an email to his supporters announcing his candidacy.

Pete Buttigieg

The former mayor of South Bend, Indiana was the first openly gay politician to join the 2020 Democratic race for the White House. He was the youngest mayor elected to a US city with over 100,000 residents by the age of 29 and serves as a lieutenant in the navy reserve.

Mr Buttigieg has climbed in the polls and enjoys fundraising on-par with that of several more nationally-recognised candidates, despite being a little-known mayor from Indiana.

Pete Buttigieg responds to Donald Trump calling him 'Alfred E. Neuman' after the Mad magazine character

Pete Buttigieg responds to Donald Trump calling him 'Alfred E. Neuman' after the Mad magazine character

Tulsi Gabbard

The US representative from Hawaii and former army medic declared her intention to run on 11 January of last year.

The 37-year-old was quickly beset by controversy, however, after it emerged she had expressed anti-LGBT+ views earlier in her career and met with Syrian dictator Bashar al-Assad, whose removal from power she opposes.

Elizabeth Warren

The Massachusetts senator has gained national recognition as a major supporter of regulating Wall Street and tackled head-on some of the biggest potential controversies that threatened to surround her during a 2020 campaign, including questions regarding her Native American heritage.

Ms Warren, who released a video and ancestry report confirming she has distant native ancestry, has become a fierce critic of Mr Trump’s anti-regulatory administration.

She suffered weak performances in the Iowa caucus and New Hampshire primary, leaving her campaign with less of a viable path towards securing the nomination than several of her competitors, including Mr Buttigieg and Mr Sanders.

Amy Klobuchar

The Minnesota senator announced her candidacy as a moderate from the midwest who was familiar with the plight of middle and working class American communities across the country.

Though she wasn't exactly a frontrunner in the initial months of the race, the senator enjoyed a strong showing in New Hampshire's primary after her debate performance and has broken her campaign's fundraising records after voters began flocking the polls.

Amy Klobuchar: 'We stand with the innocents in this world and not with dictators'

Tom Steyer

A billionaire hedge fund manager and philanthropist, Tom Steyer announced his candidacy after leading an effort to get millions of Americans to support Donald Trump’s impeachment.

The liberal activist has focused on climate change, economic injustice and creating a large tent party for Democrats by funding nearly $230m to Democratic candidates since 2014.

Though Mr Steyer has made it onto the debate stages in recent months, he failed to garner a strong showing in both the Iowa and New Hampshire votes.

Mike Bloomberg

Another billionaire presidential hopeful, Mike Bloomberg was one of the last Democrats to throw his hat in the ring for the White House.

Still, he has managed to aggravate the president, releasing duelling ads during the SuperBowl that cost both he and Mr Trump $10m separately. Mr Trump has dubbed him "Mini Mike" and claimed he was "part of the fake news" in a tweet.

Mr Bloomberg skipped the initial caucus and primary votes in Iowa and New Hampshire, instead focusing on other key states in the lead up to the general election.