I didn't.
The law has the Federal government covering 100% of the new Medicaid participants for three years. It then gradually transfers costs to the states. In 2020, the states will bear 10% of these costs.

Synopsis here:
http://topics.nytimes.com/top/news/health/diseasesconditionsandhealthtopics/health_insurance_and_managed_care/health_care_reform