Lefties take over organizations, hoping to use their credibility to advance their causes. But there's a fine line between exploiting that credibility and trashing it. Employing medical groups to push for gun control bent the partisan line. Using them to push global warming breaks it.

Assembling a variety of organizations from a spectrum of sectors into an echo chamber is daunting in a North Korean 3,000 dancers moving in unison sort of way. But it also destroys their influence outside the set of people who agree with them.

The new climate change agenda released by the groups, including the American Medical Association and the American Heart Association, comes amid early jostling among Democratic candidates over whose environmental platform is more progressive. “The health, safety and well-being of millions of people in the U.S. have already been harmed by human-caused climate change, and health risks in the future are dire without urgent action to fight climate change,” the medical and public health groups wrote in their climate agenda, shared with The Associated Press in advance of its release. Among other things, the groups are pressing elected officials and presidential candidates to “meet and strengthen U.S. commitments” under the 2015 United Nations climate agreement from which Trump has vowed to withdraw. They’re also pushing for some form of carbon pricing, although without any reference to potential taxation of emissions, and “a plan and timeline for reduction of fossil fuel extraction in the U.S.”

Of course they are.

It would have been bad enough if they were warning that the sky would call. Their claim that millions of people in America have been harmed by global warming is bizarre nonsense. And the only thing this does is destroy the credibility of the AMA and the American Heart Association.