In its second-to-last argument over the Affordable Care Act, the Supreme Court on Wednesday ponders a what-if.
Specifically, if the justices decide that Congress exceeded its constitutional authority in enacting the part of the law that requires most Americans to either have health insurance starting in 2014 or pay a penalty, does that invalidate the rest of the law? And if not, how much, if any, of the rest of the law should it strike down?