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As congressional Democrats dramatically scale back the most ambitious social spending bill since the 1960s, they\u2019re placing much of the blame on moderates who have demanded changes.\n\nOne senator, Kyrsten Sinema of Arizona, has played an outsized role in shaping the bill \u2014 but has remained quiet about why. Today, we explore what brought her to this moment.\n\nGuest: Reid J. Epstein, who covers campaigns and elections for The New York Times.