Justice Ruth Bader Ginsburg says those who are guessing publicly what the court will say on the constitutionality of President Barack Obama's health care law don't know, and those who know aren't saying.

The 79-year-old Ginsburg was speaking at the national convention of the liberal-leaning American Constitution Society.

Ginsburg said the health care arguments were some of the most closely watched in recent history, given the number of "press conferences, prayer circles, protests, counter-protests" going on during the arguments. She said justices were now wading through "knee-high" stacks of briefs.

The court is expected to make its decision in the next couple of weeks.