Remember Jonathan Gruber? You know, this guy:
https://youtube.com/watch?v=GtnEmPXEpr0%3Ft%3D31m25s
[S]o these health-insurance Exchanges … will be these new shopping places and they’ll be the place that people go to get their subsidies for health insurance. In the law, it says if the states don’t provide them, the federal backstop will. The federal government has been sort of slow in putting out its backstop, I think partly because they want to sort of squeeze the states to do it. I think what’s important to remember politically about this, is if you’re a state and you don’t set up an Exchange, that means your citizens don’t get their tax credits. But your citizens still pay the taxes that support this bill. So you’re essentially saying to your citizens, you’re going to pay all the taxes to help all the other states in the country. I hope that’s a blatant enough political reality that states will get their act together and realize there are billions of dollars at stake here in setting up these Exchanges, and that they’ll do it.
It just so happens that Obamacare’s architect says what the plain text of the statute says. Coincidence? I think not.