Bernie Sanders’s win in New Hampshire has established him as the Democratic Presidential front-runner. Centrist Democrats regard him not as a challenge but more like an existential threat: they assume that only a moderate—and certainly not a democratic socialist—can sway critical swing voters and win in November. Are they right? David Remnick speaks with Keith Ellison, the Minnesota Attorney General who served as co-chair of the Democratic National Committee after that organization infamously tried to spike Sanders’s candidacy in 2016. Ellison says that the clarity of Sanders’s mission and his appeal to economic problems can win over struggling voters in both parties. Then Nathaniel Rakich, a pollster for FiveThirtyEight, presents what the data indicates about Sanders’s chances. Plus, a civics project goes off the rails when high-school students run a simulation of the 2020 primaries.