Chief Justice John Roberts has been called to task by conservatives for siding with the more liberal justices to uphold President Obama's health care law. This week a CBS reporter said Roberts switched his views after at first siding with conservatives. Justices sometimes change their minds after the initial conference on a case as they circulate draft opinions, consult with colleagues and think about the issues. What's unusual was the leak which was an apparent attempt to undermine the chief justice. Nina Totenberg talks to Robert Siegel.