According to the report, the "scientists" they sampled seem to have come entirely from the AAAS organization.
About the Scientist Survey
Results for the scientist survey are based on 2,533 online interviews conducted from May 1 to June 14, 2009 with members of the American Association for the Advancement of Science (AAAS), under the direction of Princeton Survey Research Associates International. A sample of 9,998 members was drawn from the AAAS membership list excluding those who were not based in the United States or whose membership type identified them as primary or secondary-level educators.
I think this source is potentially highly biased, despite its claim to exclude educators.
I consider engineers (like myself) 'scientists'. But since I work for a private company, I don't participate or pay attention to publicly published magazines like
Science. My experience has been that most industry scientists have similar habits. There are 3 reasons for this behavior.
One is that private companies have their own libraries of research that they have. We keep these generic magazines in the library so individuals don't have to keep up with the magazines.
Two, industries have their own specific trade magazines they pay closer attention to.
Three, our own private research is more pertinent than the rabbit holes academia likes to delve.
It seems highly likely to me, that this organization is highly biased to the academic community compared to the much larger and more narrowly focused private scientific community.