Hillary Rodham Clinton received an important boost in her presidential campaign Wednesday with the endorsement of her presidential candidacy by the largest US public service workers' union. The American Federation of State, County and Municipal Employees represents 1.4 million members nationwide. They include service and health care workers in the public and private sectors and bus drivers, child care providers, custodians and librarians. "I am honored to receive the support of AFSCME," Clinton said in a statement. "In my administration, America's working families will again have a partner in the White House." Gerald McEntee, the union's president, said Clinton "will help rebuild America's middle class and make sure everyone shares in our country's prosperity."