The issue of public prayer has returned to the U. S. Supreme Court. Thirty years ago, the high court settled a case in Nebraska, ruling the state legislature could open its sessions with an invocation. Such prayers are commonplace in public meetings across the country. Yesterday, the justices heard arguments in a new prayer case: Two citizens of an upstate New York town sued to stop officials from opening its board meetings with invocations -- delivered to the assembled audience -- that almost always make reference to Christianity. At issue: whether those prayers represent a religious endorsement. Guest host Tom Gjelten of NPR and his guests discuss the latest case before the Supreme Court.