Actually, the states have a very strong states' rights case, in that, under this law, they are mandated (forced) to set up and administer the public exchanges.
Maybe, but this court has shown it’s not a pro-state’s rights court, and that includes the conservative justices.
In rulings where states have passed laws that are both on the liberal and conservative side of the spectrum that have challenged federal law (I’m thinking specifically marijuana and abortion), this court has always sided with federal power over state.
This court is a lot of things. In favor of expansive state’s rights it is not.