Sen. Bernie Sanders (I-Vt.) officially won the California primary, over a week after voting ended.

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The win for Sanders in California—which had the most delegates at stake—is a lone bright spot in a strong Super Tuesday night from former Vice President Joe Biden.

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The Associated Press projected Sanders would win the race shortly after 10pm CT the night of the vote, but no other organization was ready to make the call, given the number of outstanding votes.

The margin of Sanders’s projected victory in the state will determine how delegates are dispersed among candidates.

DecisionDesk called the race for Sanders, giving him 34.3 percent of the vote to Biden’s 27.5.

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It has not been announced how many delegates Sanders will receive.

Sanders also won Colorado, Utah, and Vermont on Tuesday night.

Real Clear Politics, a site that takes an average of several polls, showed support for Sanders ahead of Biden 34.7 percent to 18 percent in California as of Monday afternoon, meaning Biden overperformed there as well.

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Sanders announced victory comes in the midst of a rough two weeks for the senator, as Biden has locked up both delegates and endorsements across the country.

A week after Super Tuesday, Biden racked up major wins in Missouri, Mississippi, and Michigan.

The two are slated to debate Sunday night.

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