(Chang W. Lee | The New York Times) Hayley Smith, left, and Avery Fessenden hang out in a hammock amidst people gathered before Sen. Bernie Sanders (I-Vt.) spoke on the University of Michigan campus in Ann Arbor, Mich., March 8, 2020. "It's the job of the activist left to push political limits, staking out positions that sound radical today but could, with enough work, seem like common sense in the future," writes The New York Times columnist Michelle Goldberg.