Brian Beutler identifies a path Chief Justice Roberts could take that would leave Obamacare as is: Rule that the law makes tax credits available only for states that established their own exchanges, but that the federal government can’t bribe states that way. There would be a precedent for such a decision. Seven justices agreed in the 2012 Obamacare case that the feds couldn’t structure Medicaid funding in a way that effectively coerced the states to go along with federal desires, and rewrote the statute to avoid the problem. (I was not a fan of that decision, for what it’s worth.)