At Barak Obama's second inauguration yesterday, American Idol star Kelly Clarkson added a poignant chapter to the storied annals of America's least offensive patriotic anthem, My Country 'Tis of Thee. Seventy-four years ago, the Daughters of the American Revolution refused to let Marian Anderson perform at the association's Constitution Hall in Washington because the celebrated contralto was African-American. First Lady Eleanor Roosevelt resigned her DAR membership in protest, and weeks of controversy ensued. On April 9, 1939, 75,000 people turned out to hear Anderson sing at an outdoor Easter Sunday recital on the steps of the Lincoln Memorial. Interior Secretary...