Many legal scholars say precedent, typically given much weight in court rulings, is on the side of the law's constitutionality. But while public opinion isn't supposed to be a factor in Supreme Court decisions, many believe the unpopularity of the individual mandate will sway the justices to strike it down.
Questioning by the conservative justices during oral arguments was considered highly critical, a sign some have taken to mean the law will be in some part overturned. Other speculation, based on what has been characterized as recent light-hearted remarks from Kagan and Justice Ruth Bader Ginsberg, both liberals, has concluded the law will be upheld.
The ruling is expected to be handed down shortly after 10 a.m. on Thursday.
Rebekah Metzler is a political writer for U.S. News & World Report. You can contact her at firstname.lastname@example.org or follow her on Twitter.