Shane Harris is a staff correspondent for National Journal and the former technology editor of Government Executive magazine. In his new book, The Watchers, he chronicles the government’s efforts to create a computer system capable of analyzing data and identifying terrorist activity. Harris contends that while pinpointing threats remains difficult, the governments can now spy on U.S. citizens with ease. He joins Peter today to discuss the evolution of surveillance, America’s changing views on privacy, and the human element behind computerized data collecting.