As everyone knows, from March 26 to March 28, the Supreme Court will hear oral argument in one of the most important cases to come before the court in our lifetimes: Florida v. HHS, the case that will determine the constitutionality of the Patient Protection and Affordable Care Act. Lest you think I'm exaggerating, the High Court has assigned six hours, over three days, to hearing arguments in the case: something it hasn't done in 45 years. In this article, I'll preview the key aspects of the case, and what to look for in the courtroom.