Evidence from states that tried something similar last spring suggests that the extra enrollment time could be an effective way to bring coverage to hard-to-reach populations: younger Americans, and those who have remained uninsured despite the health law’s coverage expansion. “It wasn’t a deluge of people, but we were pleased with the type of people we were drawing in,” said Audrey Gasteier, chief of policy and strategy at the Massachusetts Health Connector. It ran a special enrollment period for nearly five months last year, and had 22,800 sign-ups as a result. Usually, about a quarter of the Connector’s enrollees are between 18 and 34. But that figure was 40 percent for those who signed up during the special enrollment period, suggesting that the pandemic may have nudged so-called Young Invincibles to decide health insurance was worth the cost.