As Americans prepare to observe the 61st annual National Day of Prayer this week, the usual debate over interpretation of the First Amendment of the Constitution, specifically the Establishment Clause, also takes center stage. But this year is special, according to some, because the May 3 observance also marks the 50th anniversary of the Supreme Court's decision that invalidated official prayer in public schools. "Some religious believers will likely use the day of prayer to call attention to what they view as a regrettable and consequential decision," John Inazu, a First Amendment expert and professor of law at Washington University...