DAVID BROCK is a Democratic activist and widely published author. In 2004, Brock founded Media Matters for America, the nation's premiere progressive media watchdog group. Following the 2010 elections, Brock founded the Super PAC American Bridge, which works to elect Democrats. Brock is a New York Times best-selling author. Among his books are the memoir Blinded by the Right: The Conscience of an Ex-Conservative, Killing the Messenger: The Right Wing Plot to Hijack Your Government, The Republican Noise Machine and The Fox Effect. His writing has appeared in the New York Times, USA Today, Huffington Post, Daily Beast, and Salon. Politico deemed him one of the 30 most powerful people in Trump's Washington.