In his latest book The Secret Man, Bob Woodward recalls that some years after Watergate he was approached by Washington Post colleague Richard Cohen. According to Woodward, Cohen had decided on his own that Mark Felt was Deep Throat and intended to say so in an upcoming article. "I lied, and insisted to Cohen that he had it wrong. W-R-O-N-G! I spelled it out, I recall," he writes. "Sorry, Richard." That Woodward would do everything within his powers to protect Felt is understandable, and considering the pressures and passing of time, his loyalty is to be applauded. But his willingness...