The numbers are not abstract: 51.7 million children — 91.7% of America’s K-12 student population — would be eligible if their state opts in. Though their parents can receive the tax credit, children living in states that have not opted in cannot receive scholarships. In California, 5.9 million children are in limbo. That leaves nearly 21 million children stuck waiting in 19 states and D.C., where leaders have yet to act. AdvertisementThe 20.8 million children still locked out aren’t a talking point.