In a beige reception hall in a Des Moines suburb, over paper plates piled with the remains of a Monday morning continental breakfast, Sen. Bernie Sanders urged a packed house of Iowans to manifest their dreams. Imagine an America where cancer only kills you, rather than also rifling through your wallet. Visualize a future where no American child has to pay off her grandmother’s student loans. Cynicism is high and more than a quarter of us believe the American Dream is unattainable, but Sanders’s stump speech offered hope. “Everything is impossible until it’s not,” he said. The crowd went wild.