Clinton won a big union endorsement Thursday.
WASHINGTON (CNN) - Democratic presidential candidate Sen. Hillary Clinton was endorsed by the Amalgamated Transit Union Thursday.
The ATU represents 180,000 bus drivers, light rail operators, maintenance workers and other transit employees in 46 states.
In a written statement, the ATU said it would work to educate its members about the New York senator's campaign and "mobilize its U.S. members and their families in the early primary states in support of her nomination."
- CNN Political Assignment Editor Katy Byron