“Around the country, MAGA extremists are lining up to take on those bedrock freedoms,” Mr. Biden said, using Mr. Trump’s Make America Great Again slogan to describe the former president’s allies. While he had repeatedly and consistently said he intended to run, Mr. Biden stoked renewed speculation by delaying his kickoff for months. Mr. Biden tapped Julie Chávez Rodríguez, a senior White House adviser and granddaughter of the iconic labor leader Cesar Chávez, as his campaign manager. But the operation is expected to be overseen from the White House by top presidential aides. While polls show that most Democrats have favorable opinions about Mr. Biden, a majority of them would still rather he not run again.

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