FILE PHOTO: Democratic U.S. presidential candidate and former Vice President Joe Biden speaks during the 11th Democratic candidates debate of the 2020 U.S. presidential campaign, held in CNN's Washington studios without an audience because of the global coronavirus pandemic, in Washington, U.S., March 15, 2020. REUTERS/Kevin Lamarque

WASHINGTON (Reuters) - Former Vice President Joe Biden is projected to win the Democratic presidential primary in Washington state, Edison Research said on Monday.

Biden defeated Senator Bernie Sanders in the state, which votes entirely by mail and had a March 10 deadline for submission of ballots.