At Camp David, a movie theater and an airplane hangar have been outfitted with lights and production equipment to create a mock debate stage. At least 16 current and former aides, summoned from Washington and Wilmington, whiz back and forth on golf carts to join President Biden in strategy sessions. And Mr. Biden’s top advisers, including Ron Klain, who is managing the debate preparations, are aware of the missteps incumbents have made in the past. In 2012, President Barack Obama flailed in his first re-election debate and had to quickly reorient for the second one. Mr. Trump, an opponent who is adept at extemporaneous insults, skipped the primary debates that could have sharpened his skills.

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Persons: Biden, Mr, Donald J, Camp David, Biden’s, Ron Klain, Barack Obama flailed, Trump Organizations: Trump Locations: Washington, Wilmington, Maryland