Sanders, 74, won Washington state by getting more than 72 per cent of the total votes counted. In Alaska, he received more than 80 per cent of the votes.
For Clinton, 68, who continues to lead in the delegate count and her path to the White House appears to be much easier as compared to Sanders, a defeat in the crucial state of Washington is seen as a major setback.
He aimed for a third victory in Hawaii where he has been bolstered by the endorsement of Tulsi Gabbard, the first ever Hindu elected to the US Congress, who resigned from a high post within the Democratic party to support the Vermont Senator and has appeared in an ad on behalf of his campaign.
Clintons, including the former president Bill Clinton, and their daughter Chelsie Clinton, spend quite a bit of time in Washington.
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"It is hard for anybody to deny that our campaign has the momentum," Sanders yesterday told more than 8,100 cheering supporters who filled an arena on the University of Wisconsin campus last night after results of the primaries in Washington and Alaska were out.
"We knew things were going to improve as we headed West," Sanders said.
He said the momentum building behind his campaign comes from big crowds at rallies, from overwhelming victories, from record turnouts at caucuses and primaries, from a grassroots campaign taking on the political establishment and from more than two million supporters who donated less than USD 30 apiece on average.
To become a Democratic party presidential nominee, Clinton or Sanders need at least 2,382 delegates of the total 4,763 delegates including 712 super delegates, who are party office bearers and are not elected as part of the presidential primaries. Super delegates are independent and are free to vote to any of the candidates.
So far, Clinton leads the race to the White House in the Democratic party as she has 1,697 delegates. This includes 1,228 delegates she won during the presidential primaries and 469 super delegates who have said they would vote for her.
On the other hand, Sanders has 976 delegates to his kitty. These include 947 delegates won by him and 29 super delegates, who have pledged support to him.