Hillary Clinton has won today's Democratic presidential caucuses in Nevada, US networks projected, giving her a much-needed victory over rival Bernie Sanders in the race for the White House nomination.

"To everyone who turned out in every corner of Nevada with determination and heart: This is your win. Thank you," Ms Clinton tweeted, shortly after Fox News and NBC News called the contest in her favour.

With roughly two-thirds of precincts reporting, Ms Clinton was at 52.2% to 47.7% for Mr Sanders.

Ms Clinton had bet big on a victory in Nevada, leveraging her popularity with Latino and other minority voters.

Victory in Nevada for the former secretary of state had once been seen as a foregone conclusion, but Mr Sanders gathered steam after trouncing Ms Clinton in New Hampshire on 9 February. Ms Clinton won the Iowa caucuses by a hair on 1 February.