MILES O’BRIEN:

But the idea has drawn controversy from some scientists, who are concerned march organizers are also advocating a host of other liberal social causes.

The rally in Boston happened in the midst of the annual meeting of the largest scientific society in the world, the American Association for the Advancement of Science.

The organization is supporting the political mobilization of many of its members.

Physicist and former Democratic Congressman Rush Holt is the CEO.

RUSH HOLT (D), Former U.S. Congressman: This would be — it's purported to be a demonstration for science, the very idea of science, the essence of science. Isn't that a wonderful idea?