Joe Biden has launched his re-election campaign with a video in which he says the country faces a pivotal moment in the 2024 vote.
The Democratic Party, however, still need convincing that he is the best candidate they have.
Polls show about half of Democrats want the party to nominate someone else – although many of those said they will still vote for him.
So who are the most prominent other people running?
Self-help guru Marianne Williamson was the first Democrat to jump into the 2024 race, with a formal campaign launch in March.
70-year-old Ms Williamson, is a long-time social justice activist, best-selling author and former “spiritual advisor” to Oprah Winfrey who made her first foray into politics in 2020.
She transfixed audiences with a frenetic performance at two Democratic primary debates, in which she declared that the only way to defeat Donald Trump was to “harness love for political purposes”.
Her 2024 policy platform backs universal government-run healthcare, free childcare, at least $1tn (£800bn) in slavery reparations to black Americans and a federal agency called the Department of Peace.
Robert F Kennedy Jr
Anti-vaccine activist Robert F Kennedy Jr has filed paperwork to run for the White House and will launch his campaign later in April.
The nephew of President John F Kennedy and the son of slain US Attorney General Bobby Kennedy, is at least the 12th member of the Kennedy dynasty to run for political office.
The long-time environmental lawyer once won plaudits for campaigning on issues such as clean water, including working to clean up the Hudson River in New York.
69-year-old Kennedy’s vaccine scepticism long predated Covid-19, but he found a new audience during the pandemic, when revenues to the anti-vaccine non-profit he founded in 2011 doubled.