Two union leaders and longtime Democratic National Committee members have resigned from the national party, marking the latest internal dispute of chairman Ken Martin’s tenure.

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.

Two powerful union heads, Randi Weingarten and Lee Saunders, leaving the Democratic Committee is another sign of the internal conflict plaguing the party as it tries to find a path