HOPE: Rift Between Labor and Environmentalists Threatens Democratic Turnout Plan.

The rift developed after some in the labor movement, whose cash flow has dwindled and whose political clout has been increasingly imperiled, announced a partnership last week with a wealthy environmentalist, Tom Steyer, to help bankroll a new fund dedicated to electing Democrats.

That joint initiative enraged members of the nation’s biggest construction unions, already on edge about the rising influence of climate-change activists. The building-trades unions view Mr. Steyer’s environmental agenda as a threat to the jobs that can be created through infrastructure projects like new gas pipelines.

The dispute, laid bare in a pair of blistering letters sent on Monday to Richard L. Trumka, president of the A.F.L.-C.I.O., underscored the tensions between the two pillars of the Democratic coalition.

There are plenty of these rifts to be exploited in the Democrat coalition, including Millennials vs the university system which exploits them, and African Americans vs the public eduction system which exploits them, too.

If only someone had written a book about that…