This Wednesday, Aug. 28, on the 50th anniversary of the March on Washington and Dr. Martin Luther King’s famous “Dream” oration, President Barack Obama will speak from the steps of the Lincoln Memorial, joined by former Presidents Bill Clinton and Jimmy Carter. Much of the press is speculating about whether the president can reach the “King standard.” Can he deliver an address with the poetry and the vision that made Dr. King’s speech timeless? But I suggest to you that this is the wrong standard by which to measure the president. Barack Obama isn’t the leader of a March on …