Cal Thomas: "A Traitor In The Midst"

In Townhall today, Cal Thomas discusses the CIA leaks of Mary McCarthy.

What do you call someone who, in violation of her oath, reveals government secrets to a reporter, who then prints them and exposes a clandestine operation designed to get information from suspected terrorists that could save American lives?

Here is what one dictionary says about that word: "One who betrays another's trust or is false to an obligation or duty." The word so defined is traitor.