[PJ-Comix]

38 states refused to participate.

I thought it was 36 states.

[Jewbacca]

Could be. 30 ish.

[DAC21]

Here is a map State by State. It is a bit old so there could be some changes.

http://www.washingtonpost.com/blogs/wonkblog/files/2013/02/final-exchange-map.png

Mostly right leaning States. I wonder if PA, Maine, and Virginia try to change to a State exchange to get around the decision. Maybe the ship has sailed to attempt that?