Sanders trounces Clinton in three states

Bernie Sanders made a clean sweep of Democratic election contests in Alaska, Hawaii and Washington, although he barely dented the formidable lead enjoyed by front-runner Hillary Clinton in the battle for the party's presidential nomination.

US news networks showed Sanders winning by wide margins Saturday's caucus votes in all three western states.

In Washington - the biggest prize with 101 delegates up for grabs - Sanders won with an estimated 72.1 percent, against 27.7 for Clinton.