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.

The head of a prominent U.S. teachers union resigned from her position in the Democratic Party on Sunday, saying she was "out of step" with its leadership.

Today’s installment of campaign-related news items from across the country.* In another major setback for Democratic National Committee Chair Ken Martin, the leaders of two influential labor unions — the American Federation of Teachers’ Randi Weingarten and Lee Saunders,