RomneyCare was superseded by ACA in Massachusetts.

And "selling across state lines" is complete BS. No insurance company will ever do that, because their premiums are calculated on health care costs in each state. They don't pay out certain amounts, they cover certain procedures. Those covered procedure have different costs for the insurance companies in different states. If a cheap-state company wanted to sell a policy in an expensive-state they would have to charge the rates for the expensive-state. So the whole idea of buying a cheaper policy from some other state just falls apart.

Besides, most insurance companies sell policies that tie you to a specific medical group in their state (or even in their county!). What are you going to do, fly from New York to Kentucky every time you want to see your doctor?

This fundamental misunderstanding of how insurance works is just another of many retold endlessly by Republicans, who care more about rhetorical bulletpoints than reality.