UNIMPEACHABLE

In The World According to Garp, Robin Williams and his wife are looking at a house to purchase when a light airplane literally crashes into it. Williams' line is "Honey, the chances of another plane hitting this house are astronomical. See? It's been pre-disastered. We're going to be safe here."

That sounds to me like what Dan Rather must have been thinking when he called Burkett an unimpeachable source. Burkett had, for all practical intents and purposes, already been impeached. In at least one instance, the man had impeached his own statement.

From The Houston Chronicle:

... Burkett's allegations have changed over the years, and have been dismissed as baseless by former Guard colleagues, state legislators and others.

Even Burkett has admitted some of his allegations are false.

Emphasis added. I can just see Rather thinking to himself, "The odds of Burkett being impeached again are astronomical. He's pre-impeached. We're going to be safe here."