President Biden’s approval ratings are in the toilet and polls show him losing to likely GOP opponent‚ former President Donald Trump‚ as young voters turn their backs on the incumbent Democrat. Mr. Biden’s campaign is eyeing mega-pop star Taylor Swift for help. They want Ms. Swift to endorse him‚ as she did in 2020. Ms. Swift’s Eras Tour has drawn as many as 71‚000 fans to a single show and is the highest-grossing music tour of all time. His campaign could send him to visit during her...