David Brock is the author of the best-selling memoir Blinded by the Right: the Conscience of an Ex-Conservative. Brock defected from the Republican Party in the latter half of the 1990s and came to renounce the anti-Clinton movement in which he took part. His new book is The Republican Noise Machine: Right-Wing Media and How it Corrupts Democracy. He now heads a nonprofit media watchdog organization in Washington, D.C.