Bernie Sanders has cemented his status as the Democratic front-runner to take on Donald Trump in November’s US presidential election.
He has a decisive lead over his rivals in the Nevada caucus, with results from half the precincts counted.
But there is a long way to go until a Democratic nominee is confirmed.
Results from Saturday’s vote also show former vice-president Joe Biden coming second, a better performance than in the two states which have voted so far.
He had underwhelming results in Iowa and New Hampshire. Those states kicked off the four-month long primaries process, in which candidates are jostling to convince voters why they are the best candidate to challenge Mr Trump.
What’s the latest from Nevada?
So far, with 50% of the ballots counted in Nevada, Mr Sanders, the left-wing senator for Vermont, has 47% of the vote, ahead of Mr Biden on 19%. The field is then split between a number of other moderates, with Pete Buttigieg on 15% and Elizabeth Warren on 10%.
Mr Sanders won in 11 of Nevada’s 17 counties.
Candidates who have won more than 15% of the vote will be awarded delegates, who will then go to the party’s convention in July to support their Democratic candidate.
Before Saturday, Mr Sanders had 21 delegates, and while he will remain a long way off the 1,990 needed to become the nominee, victory in Nevada will bring him another small step closer towards that total.
The last caucuses in Iowa were plagued by technical glitches that meant results struggled to be recorded using a new app. While that app is not being used in Nevada, there are reports of volunteers struggling to connect to a telephone number used to record results. Organisers say results should start flowing soon.
In a victory speech in Texas on Saturday evening, Mr Sanders praised his “multi-generational, racial coalition” team of supporters, and attacked Mr Trump. “The American people are sick and tired of a president who lies all the time,” he said.
Mr Biden’s campaign was in buoyant mood too, declaring that “the comeback starts here”. In a tweet, Mr Trump praised Mr Sanders’ win, but also called him “Crazy Bernie”.
Meanwhile Mr Buttigieg suggested on Twitter that he is the only Democratic candidate with the potential to beat Mr Sanders to the nomination.
How has Bernie Sanders done so well?
It looks like it’s all down to a few key factors.
- Polling agency Edison Research said more than half of participating Hispanics had decided to vote for him before the caucuses. In a state of more than three million people where Hispanics make up a third of the population, this mattered
- Despite some concern from union members about Mr Sanders’s plan to shake up their delicately negotiated healthcare plans, 36% of union members backed him. One in four Nevada residents is in a union, or has a relative in a union
- Polls suggest he did well across all age groups – apart from over-65s. He was especially popular among young voters in Nevada, and among white college-educated women, who are expected to be a key demographic in November’s election
What happens next?
All eyes turn to South Carolina’s primary next Saturday. It will be the biggest of the four states to have voted before March – and the one with the largest percentage of African-American voters.
This should favour Mr Biden, who is popular among African Americans, but Mr Sanders is also expected to do well, and polls suggest that billionaire hedge-fund manager Tom Steyer could claim his first delegates there.
A few days later, on 3 March, is Super Tuesday, when 14 states vote. They include California and Texas, the two states with the most delegates. By the end of Super Tuesday, it may be much clearer who the Democratic candidate will be.
The Super Tuesday votes will include former New York Mayor Michael Bloomberg, who is not competing in the first four Democratic leadership ballots.