Today comes news that the Secretary of Homeland Security, Janet Napolitano, is replacing Roger Mackin with Phillip Mudd. Who? What? So? Roger Mackin was the undersecretary for intelligence and analysis. He was responsible for the memo issued just before the 750+ Tea Parties attended by 1 million+ Americans. You know that memo, which said people who oppose abortion, attend church, and own legal guns are potential terrorists. And don’t forget that it also said veterans returning from Iraq or Afghanistan are risky, too. Before talking about that appalling memo, let’s back up a minute. What is the purpose of the...