The United States Supreme Court embarks today on three days of momentous hearings into President Barack Obama's healthcare reforms that could not only upend the 2012 election campaign but also redraw the limits of Congressional power and the division of authority between federal government and the states.
The oral arguments before the nine justices come two years after the then Democrat-controlled Congress passed Obama's greatest legislative achievement, without a single Republican vote. Now, after a string of conflicting rulings in lower courts, the country's highest judicial authority will rule whether "Obamacare" is constitutional - or whether all or part of it should be struck from the statute books.
Despite unprecedented pressure, the court has refused to lift its ban on live television or radio coverage. Since Saturday, queues have been building for the 200 public seats in the colonnaded courtroom where the black-robed justices will question lawyers for the Government and the 26 states opposed to the law. A host of demonstrations will take place outside the court building across the street from the US Capitol.
The hearings will last six hours in all, the longest for any case in almost half a century. Public opinion is split roughly evenly on the law, the biggest overhaul of healthcare in the US since the 1965 Medicare and Medicaid acts that set up government schemes for the elderly and the poor. For the first time it would bring close to universal coverage to a country where a sixth of the population now lacks health insurance.
It would do so by retaining America's system centred on employer-based coverage and operated by for-profit insurance companies. But the latter will henceforth have to provide coverage for all who apply - and in return everyone, healthy or otherwise, left uncovered will be required to buy coverage or face a fine. This so-called "individual mandate" is at the heart of the controversy.