A mistake has been made in the Oval Office makeover that goes beyond the beige. President Obama's new presidential rug seemed beyond reproach, with quotations from Abraham Lincoln, Theodore Roosevelt, Franklin Roosevelt, John F. Kennedy and the Rev. Martin Luther King Jr. woven along its curved edge. "The arc of the moral universe is long, but it bends toward justice." According media reports, this quote keeping Obama company on his wheat-colored carpet is from King. Except it's not a King quote. The words belong to a long-gone Bostonian champion of social progress. His roots in the republic ran so deep...