Gov. Ralph Northam (D-VA) signed a bill into law Thursday that will allow more people to sign up for health care coverage paid for by the Medicaid program. This is projected to move 400,000 low-income residents onto the program. Lawmakers arrived at a compromise on Medicaid and on other parts of spending in part by setting a tax on hospitals. Under Obamacare, the federal government paid for all of the cost of Medicaid expansion in states beginning in 2014, but this support will fall to 90 percent of costs by 2020. In some states, that will mean billions of dollars in additional spending.