Stung by political setbacks and scrambling to avoid a repudiation of Democrats at the polls this November, a coalition of labor unions and liberal activist organizations is planning what it calls “the biggest progressive demonstration in decades” at the Lincoln Memorial next Saturday, October 2.

The march, called “One Nation Working Together,” is sponsored by the AFL-CIO, the NAACP, the Service Employees International Union, La Raza, the American Federation of State, County and Municipal Employees, the American Federation of Teachers, the Rainbow Push Coalition, the Campaign for America’s Future, and several other activist groups. The event is also being promoted by Organizing for America, the permanent wing of the Obama presidential campaign, which is sending out email notices to members asking that they travel to Washington to take part.