WASHINGTON—Powered by a string of Super Tuesday wins that set up a protracted Democratic presidential primary battle, Joe Biden planned a campaign event and evening fundraiser Wednesday in Los Angeles. Rival Bernie Sanders won the day’s largest prize of California, and the final allocation of Tuesday’s pledged delegates in the coming days will likely put them in close contention for the nomination.

The former vice president and Vermont senator dominated the 14 states that voted Tuesday—prompting former New York Mayor Michael…

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