In the postelection uncertainty, all eyes were on Pennsylvania. And John Fetterman, the state’s Twitter-famous lieutenant governor, held court. He rallied Democrats with one-liners and taunted President Trump with arithmetic lessons on Twitter. Mr. Trump can try to challenge the election result, he said, but “you can’t litigate math.”

Mr. Fetterman, the former mayor of a Rust Belt town, is 6-foot-8, with tattoos, a shaved head and a graduate degree in public policy from Harvard. He’s not your standard politician. And that’s helped him sell progressive politics to working-class voters and become a powerful voice of the left.

In this interview with Kara Swisher, Mr. Fetterman explains the “purple churn” in Pennsylvania and why Mr. Trump’s increasingly desperate pleas for a recount won’t reverse a Biden victory. “There is no enchanted village in Pennsylvania full of 50,000 Trump voters that we haven’t heard from already,” he says. “It doesn’t exist.”

You can find transcripts (posted midday) and more information for all episodes at nytimes.com/sway, and you can find Kara on Twitter @karaswisher.