the obamacare, legal and political future, let's begin with nicholas baggaley, professor of health lawnd policy at the university of michigan. welcome to the programme. >> thank you for having me. >> what was the essential question at the core of this case - how big versus ber well? >> well, as you explained in the introduction, the biggest problem for health insurance is it's unaffordable for many people. part of the plan of the affordable care act was to extend tax credits to people that may have been unable to afford health insurance on the exchanges. the language of the statute governing the calculation of the amount of the tax credits is tucked in a corner of the act, saying that the cal collision is to the amount of a health plan purchased established by the state. the d.c. circuit ruled that that language confined tax credits to state-established exchanges. the fourth circuit said we have to read the provision in the context of the act as a whole. if que read the provisions -- if we read the provisions we would defeat the broader goals of the legislation, and reach a result cong