We need Dr. King's radical vision. We don't need a convenient hero.

  It was storming the night Dr. Martin Luther King Jr. delivered his final speech in Memphis, a storm so thunderous it made him jump at the pulpit.

  It was storming again on the 50th anniversary of that speech, the night we arrived in Memphis to take part in the National Civil Rights Museum’s ceremony outside the Lorraine Motel, where King was assassinated in 1968.