This was one of the things that Obama changed, without Congress. They thought that all the states would jump on board, with this world saving
legislation. Just another case of Obama thinking he can do anything.
This was number 3 of the 24 changes he made, unilaterally.
3. Subsidies may flow through federal exchanges: The IRS issued a rule that allows premium assistance tax credits to be available in federal exchanges although the law only specified that they would be available “through an Exchange established by the State under Section 1311.” (May 23, 2012)
http://www.galen.org/newsletters/cha...macare-so-far/