American Council on Science and Health
is an advocacy group consisting of hundreds of scientists, doctors and policy experts devoted to science outreach. They've been around since the 1970s, when the core of their original group, including Nobel Laureate Norman Borlaug, the "father of the Green Revolution", wondered why there were no science groups that offset the wonks promoting fear and doubt about researchers.
Since then, they have gone where the data takes them. Co-founder Dr. Elizabeth Whelan has been attacked by both food fetishists and Big Tobacco for promoting inconvenient truths about science. Bipartisan disdain means they are probably right where they need to be.