Labor economists hate EFCA?

When I first saw the post on a survey of labor economists on the anti-union, anti EFCA site Unionfacts.com I read it as a "dog bites man" piece. But looking at the questions and the survey methodology (e-mail) something more remarkable than the touted results appears.
It is amazing that 36% of those surveyed favored card check and only 47% opposed federally appointed arbitrators imposing binding contracts covering wages, benefits and other issues. Granted labor economists might have a more nuanced view of EFCA, but this support is surprisingly high compared to surveys of the general public.