New Jersey Sen. Cory Booker, whose presidential campaign has focused largely on criminal justice reform, just made a big promise to incarcerated people: If elected, he pledged Thursday morning, he would immediately initiate clemency proceedings for roughly 17,000 people in prison for nonviolent drug offenses. For perspective, former President Barack Obama granted clemency to about one-tenth that number during his entire time in office—and he used his clemency powers more liberally than any president in decades. “The War on Drugs has been a war on people, tearing families apart, ruining lives, and disproportionately affecting people of color and low-income individuals—all without making us safer,” Booker said in a statement announcing the plan.