US elections: Who are the Democratic candidates?

The US senator from Vermont is making his second attempt at becoming the Democratic nominee for president. The Vermont resident, raised in New York City, is a self-described democratic socialist whose liberal policies include medicare for all and free tuition to public universities.

Characterized as a moderate Democrat, the former vice president under Barack Obama is making his third presidential bid — after unsuccessful campaigns in 1988 and 2008. Republican President Donald Trump in December was impeached for pressuring Ukraine to investigate Biden's son, Hunter.

The US senator from Massachusetts is making her first presidential run after declining to do so in 2016. She is a progressive Democrat who has proposed plans to introduce a wealth tax, reduce student debt in the US and to offer free tuition at public universities.

The former Mayor of South Bend, Indiana became a candidate for the Democratic nomination after the Iowa caucus results saw him neck-and-neck with Sanders. A moderate, Buttigieg is a self-described democratic capitalist who advocated for working with labor unions, and released a three-part plan to combat climate change. Buttigieg pulled out of the race ahead of the Super Tuesday primaries.

The US senator from Minnesota was a darkhorse candidate who struggled to pull in broader support outside her home state. She is a moderate, experienced lawmaker who has called for a $100 million plan to combat drug and alcohol addiction and urged improvements on mental health care. Klobuchar pulled out of the race shortly before Super Tuesday, throwing her support behind Biden.

The former Independent New York City mayor and billionaire business mogul is making his first run in the presidential race. He joined the bid to be the Democratic nominee after he voiced dissatisfaction with the Democratic field, with anti-establishment figures gaining steam. He has unveiled election plans that call for a wealth tax, gun control and environmental protections.