Democrats/Republicans
American Fed. of State, County, & Municipal Employees$40,281,900/$547,700
Intel Brotherhood of Electrical Workers29,705,600/679,000
National Education Association27,679,300/2,005,200
Service Employees International Union26,368,470/98,700
Communication Workers of America26,305,500/125,300
Service Employees International Union26,252,000/1,086,200
Laborers Union25,734,000/2,138,000
American Federation of Teachers25,682,800/200,000
United Auto Workers25,082,200/182,700
Teamsters Union24,926,400/1,822,000
Carpenters and Joiners Union24,094,100/2,658,000
Machinists & Aerospace Workers Union23,875,600/226,300
United Food and Commercial Workers Union23,182,000/334,200 AFL-CIO17,124,300/713,500
Sheet Metal Workers Union16,347,200/342,800
Plumbers & Pipefitters Union14,790,000/818,500
Operating Engineers Union13,840,000/2,309,500
Airline Pilots Association12,806,600/2,398,300
International Association of Firefighters12,421,700/2,685,400
United Transportation Workers11,807,000/1,459,300
Ironworkers Union11,638,900/936,000
American Postal Workers Union11,633,100/544,300
Nat'l Active & Retired Fed. Employees Association8,135,400/2,294,600 Seafarers International Union6,726,800/1,281,300