American Federation of Teachers President Randi Weingarten, a longtime key member of the Democratic National Committee, is leaving the DNC, according to a letter obtained by POLITICO.

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.

In her resignation letter, Randi Weingarten referenced her disagreements with Democratic National Committee Chairman Ken Martin's leadership as a reason she couldn't continue as one of the organization's leaders.