U.S. Sen. Raphael Warnock just introduced a bill that would cap Americans’ out-of-pocket spending on insulin at $35 a month. The legislation would be a godsend to patients battling diabetes. Many of them currently face hundreds of dollars in monthly out-of-pocket costs — an unaffordable burden for many low- and even middle-income Americans. These patients often skip injections and self-ration their insulin at enormous risk to their health, since untreated diabetes can lead to blindness, limb amputations and even death. Diabetes patients account for a quarter of all U.S. health care spending.