During Donald Trump’s crude and shambolic first run for president in 2016, Michelle Obama offered a mission statement for the Democratic Party that doubled as a pithy summary of her family’s political project: “When they go low, we go high.” Obama served the role that former President Bill Clinton played for him in 2012, when Clinton delivered a stem-winder at the convention that articulated the case for a second Obama term better than Obama had managed to do. Ben Rhodes, a former Barack Obama adviser, told me he sees a continuity between the pre-Trump Democratic Party and Obama’s approach now.