DETROIT (AP) – Joe Biden had another big night in the Democratic presidential primary, capturing four more states, including Michigan.

The key battleground state helped propel Bernie Sanders’ insurgent candidacy four years ago, and the loss on Tuesday dealt a serious blow to his 2020 campaign.

Sanders’ narrow hopes for good news rested on North Dakota and Washington state, where votes were still being tabulated.

In the first batch of results from Washington, released late Tuesday night, Sanders and Biden are essentially tied — with each claiming about 33% of the roughly 1 million counted votes.

Most counties in Washington state will next provide an update about their results Wednesday.

Biden also won Missouri, Mississippi and Idaho, showing strength with working-class voters and African American voters.

During an appearance near his Philadelphia campaign headquarters, Biden called Tuesday’s vote “another good night” and “a step closer to restoring decency, dignity and honor to the White House.”

In a subdued tone, Biden reached out to supporters of struggling rival Sanders, thanking him and his following “for their tireless energy and their passion” and their common goal: to “beat Donald Trump.”

Biden reminded his supporters — and a national television audience — of the former rivals who have endorsed him, more recently California Sen. Kamala Harris and New Jersey Sen. Cory Booker, saying: “We’re bringing this party together. That’s what we have to do.”