Union leaders are gearing up to mobilize millions of members in 26 states over the next two months as they try to help Democrats hold onto their majority in the House and Senate.

The nation's largest labor federation plans to spend more than $50 million targeting 70 House races and 18 Senate races with television ads, phone banks and leaflets.

AFL-CIO president Richard Trumka says voters can keep working to improve the economy under Democrats and President Barack Obama or return to the days "when Wall Street and corporations ran wild and controlled the agenda."

The federation is also running a nonpolitical TV ad in major markets over the Labor Day weekend to boost the image of unions as organizations that help improve the lives of working people.