Bernie Sanders won overwhelming victories in Washington state and Alaska on Saturday, narrowing Hillary Clinton's still significant lead in the race for delegates to win the Democratic nomination for president.

Sanders defeated Clinton in Washington's caucuses 75% to 25% and 79% to 21% in Alaska's, with about 38% and 72% of the states' precincts reporting.

"We knew from day one we were going to have a hard time politically in the deep south - that is a conservative part of the country," Sanders told supporters in Madison, Wisconsin. "But we knew things were going to improve as we head west.

"We are making significant inroads in Secretary Clinton's lead," he said. "We have a path toward victory."

Clinton won Arizona 57% to Sanders' 41%.
Oregon primaries are May 17.
California and New Mexico June 7.