Former Vice President Joe Biden narrowly won the Democratic primary in Washington state over one week after it took place.

With 96% of precincts reporting, Biden had secured the lead with 37.9%. Sen. Bernie Sanders (I-Vermont) came in a close second with 36.5%. Biden earned 43 delegates and Sanders received 41.

Sanders had overwhelmingly won in 2016 against former candidate Hillary Clinton and was projected to be the favored candidate. Winning Washington would have also been critical to reinvigorating Sanders’ faltering campaign.

Washington’s contest occurred last Tuesday, along with Michigan, Missouri, Mississippi, North Dakota and Idaho, but it was the last state to declare a winner.

Biden won the primary in each of those states except North Dakota, which Sanders won.

The win in Washington, followed by Biden sweeping victories in Arizona, Illinois and Florida, demonstrated the immense momentum the campaign has taken on since Super Tuesday.

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Biden’s campaign faltered in the beginning, as he failed to perform in early states like Iowa and New Hampshire and drew questions about his electability versus President Donald Trump. Now the trajectory has shifted course and Sanders, once head of the Democratic pack, is seeing his chances of becoming the Democratic nominee fade away with every win for Biden.