jess brevin, tell us about the chief justice. >> the chief justice when in private practice and working the solicitor general's office, considered one of the best supreme court advocates of his day. someone who can easily internalize an argument whether or not he agrees with it and express it quite compellingly. we saw that in many arguments and certainly we saw it yesterday where qui cogently articulated both sides of the debate, and, therefore, left it somewhat side he most fully believes in. so that's why most observers say along with justice kennedy, chief justice roberts, ultimate decision in this case may not b members of the court. what he's saying there, however, again, and this is frequent in supreme court arguments, they say things which have tremendou lawyers. what he is doing, refer tng in the early 19th century regarding the federal commerce power, and other federal powers, esnt if that power exists, then the congress and the federal government cand. and so, therefore, and not because among other things, the constitution gives congress the power to enact anything necessary

. >> jess brevin on twitter. finding this health care act unconstitutional, must the court overturn precedent? if so, which case? >> well, probably not. there is no -- because there has nerve are ban program designed exactly like this, there is no precedent on point. that's one reason it's been such an exciting case for legal in other words to follow, anerds f they're going into uncharted territory. there are presidents that point in both directions and both sides of season but nothing that is exactly right. so it is very unlikely that the court are overrule any existing cases. what they will do, if they do block this mandate, is that they will clarify limits that they have inferred from prior cases. so i think it is unlikely they will explicitly overrule any existing cases. >> joy, democratic caller in san clemente, california. welcome. >> caller: good morning. >> good morning. >> caller: i have a couple of comments here. i've heard a couple of callers, both from yesterday's "wall street journal" and today's, ab