The medical missionary Marcus Whitman is the martyr hero of one of the great legends of the American Northwest. Unfortunately the story behind the legend, a cross-country trip to the White House to save Oregon from a British takeover was almost entirely untrue.  Author Blaine Harden's new book, Murder at the Mission: A Frontier Killing, Its legacy of lies and The Taking of the American West replaces the legend -- made up by Dr. Whitman's life-long rival and enemy -- with the facts.