He has also embraced podcasts, and recently recorded a more than three-hour-long appearance with Joe Rogan, whose immensely popular show reaches 11 million listeners per episode. The show, which has been criticized for spreading misinformation, largely caters to young men, and many of his listeners fall on the center-right of the political spectrum.

On the show, Mr. Kennedy described the modern Democratic Party as the “party of censorship.”

Jason Calacanis, a co-host of a popular podcast on which Mr. Kennedy appeared in May, said in response to questions about Mr. Kennedy’s appeal that his willingness to talk for hours on a podcast stood in contrast to Mr. Biden, who has held few news conferences.

“In the age of podcasting, Americans want someone sharp and willing to engage in vibrant debates,” Mr. Calacanis said. “Trump won in 2016 because of social media, and the next president will win because of podcasts.”

Mr. Kennedy and his PAC are drawing significant support from the tech world, including Jack Dorsey, the founder of Twitter who endorsed Mr. Kennedy, and David Sacks, a venture capitalist who has raised money for Republicans and Democrats alike.

Mark Gorton, a New York City trader who created the file-sharing service LimeWire, helped create and fund a PAC supporting Mr. Kennedy. The PAC, American Values 2024, has taken in at least $5.7 million, its leadership says — official numbers will be released next month.

Mr. Gorton said the pandemic “unlocked all this energy” among a “very marginalized group” of people pushing back against public health protocols who found themselves ostracized or “de-platformed” on social media. In Mr. Kennedy, they saw a hero.

Bill Barger, a 31-year-old from Manchester, N.H., who attended Mr. Kennedy’s speech Thursday, said he was “definitely interested” in Mr. Kennedy. But he wasn’t yet sold on Mr. Kennedy’s commitment to free speech.

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