At last, the verdict. 

Republicans and Democrats are girding for a politically explosive week as the Supreme Court prepares to rule on the federal health care overhaul.

The court ruled Monday on Arizona's immigration law, and the health care ruling isn't expect later this week, possibly Thursday, the last day of the court's session.

The health care ruling, as campaign advisers are well aware, has the potential to re-shape this year's presidential race. For weeks, each party has been positioning itself to make the best of whatever outcome emerges from the tight-lipped justices. 

And the implications go far beyond the 2012 election. The outcome of the health care case, involving one of the most divisive domestic policies in modern times, will affect millions of Americans. Calling for the law's survival, supporters trumpet the expanded consumer protections and subsidies that make insurance more available and affordable.