Large federation of labor unions is strongly Democratic.
A super PAC and a nonprofit sister organization launched by former Obama White House staffers as a Democratic counter to American Crossroads/Crossroads GPS.
Democratic-leaning labor union representing 2.1 million health care, government and property management workers.
A liberal super PAC that conducts opposition research to aid Democratic candidates and organizations.
A 501(c)(4) founded by a former Republican senator and a longtime GOP fundraiser. It focuses on keeping the House in Republican control.
Affiliated liberal groups founded by a Democratic political strategist and heavily funded by labor unions.
A liberal super PAC founded by San Francisco billionaire and climate-change activist Tom Steyer that focuses on environmental issues.
A super PAC that has opposed House incumbents from both parties in primary elections.
An environmental group launched in 1969 that targets a “Dirty Dozen” list of politicians for defeat.
A labor union that represents more than 1.6 million public sector employees and retirees.