Last week, by 2-1 vote, a Washington, D.C., appellate panel ruled that the Obama administration unlawfully changed Obamacare. Meanwhile, on the same day, on the same question, a panel from the 4th Circuit Court of Appeals ruled the other way. This issue is headed for the Supreme Court.

Michael Cannon, director of health policy studies at the Cato Institute, is — according to CNBC — the “intellectual godfather” of what is perhaps Obamacare’s most serious court challenge. Cannon says when Congress drafted Obamacare, they made it clear: Tax credits, grants and other subsidies would be available only to those enrollees who sign up via state-funded exchanges.