The Affordable Care Act, otherwise known as “Obamacare,” has brought health insurance to millions of Americans. But millions more remain uninsured. Some of that is expected; some young people, for example, have declined to sign up for insurance, and many immigrants were intentionally excluded by the law. But nearly 4 million Americans fall into the “Medicaid gap” — they were meant to be covered under the law, but many Republican-led states declined to expand Medicaid as originally intended.
