Professor Pam Karlan discusses the stakes involved in the outcome of the Supreme Court's ruling on whether the Health Care Law is constitutional with USA Today's Joan Biskupic.

The case is shaping up to be the most contentious at the Supreme Court in more than a decade, but everyone involved agrees at least on one point: They need to know as soon as possible whether the new health-care law is constitutional.

The legislation, whose passage consumed much of President Obama's first year in office, extends insurance coverage to more than 30 million Americans through various measures including the expansion of Medicaid and a mandate that most Americans buy health insurance by 2014.

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"The stakes are huge going into the case," says Stanford University law professor Pamela Karlan. "The case will determine how much power the federal government has to deal with life in the 21st century, health care being among the most important issues."