WASHINGTON — To her friends and admirers, she’s a lone voice in the wilderness pushing an issue that the intelligence community establishment refuses to confront. To her detractors, she’s an eccentric perennial gadfly who cannot get beyond an obsession with a single issue: Iraq’s involvement in terrorism. Say what you will about Laurie Mylroie, author of the just released book, “Bush vs. the Beltway: How the CIA and the State Department Tried to Stop the War on Terror” (Reganbooks), but one thing’s for sure: she has opinions, they are unorthodox but strong, and she is willing to stick up for...