(CNN) - "Every hero becomes a bore at last."
That's a famous line from the 19th century philosopher Ralph Waldo Emerson, but it could also apply to a modern American hero: the Rev. Martin Luther King Jr.
As the nation celebrates King's national holiday Monday, it's easy to freeze-frame him as the benevolent dreamer carved in stone on the Washington Mall. Yet the platitudes that frame many King holiday events often fail to mention the most radical aspects of his legacy, says Jeanne Theoharis, a political science professor at Brooklyn College and author of several books on the civil rights movement.
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