Randi Weingarten of the American Federation of Teachers and Lee Saunders of AFSCME, declined offers to stay on. Weingarten cited disagreements with Martin.

Randi Weingarten, head of one of the nation’s most influential teachers unions, and Lee Saunders, the president of a large union of public workers, each pointed to Ken Martin’s leadership.

They expressed frustration over the DNC’s break-up with American Federation of Teachers President Randi Weingarten and AFSCME President Lee Saunders — who between them represent millions of members — as the latest sign of a widening gap between party leadership and the labor movement, a once-core part of the Democratic coalition.