while they may have avoided the word evolution to placate anti-evolutionists, the overall focus on the subject was not greatly diminished, and the books were still implicitly evolution based. It has also been suggested that the narrative of evolution's being removed from textbooks due to religious pressure, only to be reinstated decades later, was an example of "Whig history" propagated by the Biological Sciences Curriculum Study, and that the shift in the ways biology textbooks discussed evolution can be attributed to other race and class based factors. In 1958 the National Defense Education Act was passed with the encouragement of many legislators who feared the United States education system was falling behind that of the Soviet Union. The act yielded textbooks, produced in cooperation with the American Institute of Biological Sciences, which stressed the importance of evolution as the unifying principle of biology. The new educational regime was not unchallenged. The greatest backlash was in Texas where attacks were launched in sermons and in the press. Complaints were lodged with the State Textbook Commission. However, in addition to federal support, a number of social trends had turned public discussion in favor of evolution. These included increased interest in improving public education, legal precedents separating religion and public education, and continued urbanization in the South. This led to a weakening of the backlash in Texas, as well as to the repeal of the Butler Law in Tennessee in 1967. Publicity Edward J. Larson, a historian who won the Pulitzer Prize for History for his book Summer for the Gods: The Scopes Trial and America's Continuing Debate Over Science and Religion (2004), notes: "Like so many archetypal American events, the trial itself began as a publicity stunt." The press coverage of the "Monkey Trial" was overwhelming. The front pages of newspapers like The New York Times were dominated by the case for days. More than 200 newspaper reporters from all parts of the country and two from London were in Dayton. Twenty-two telegraphers sent out 165,000 words per day on the trial, over thousands of miles of telegraph wires hung for the purpose; more words were transmitted to Britain about the Scopes trial than for any previous American event. Trained chimpanzees performed on the courthouse lawn. Chicago's WGN radio station broadcast the trial with announcer Quin Ryan via clear-channel broadcasting first on-the-scene coverage of the criminal trial. Two movie cameramen had their