Someone is claiming this group was responsible for the sick ad...
Citizens For Progress
Service Employees International Union $3,168,192
NE REGIONAL COUNCIL of CARPENTERS $1,700,000
American Federation of Teachers $1,305,173
United Steelworkers $1,179,900
Plumbers/Pipefitters Union $937,372
Democratic Congressional Campaign Cmte $893,764
Intl Brotherhood of Electrical Workers $654,066
Sheet Metal Workers Union $609,200
Uline Inc $600,000
Sierra Club $499,937
Democratic Senatorial Campaign Cmte $427,453
United Food & Commercial Workers Union $400,100
Women Vote! $400,000
Carpenters & Joiners Union $385,949
ActBlue $384,321
Coca-Cola Co $350,180
Delaware North Companies $317,500
Plumbers/Pipefitters Union $297,733
Ironworkers Union $285,004
State Farm Insurance $273,840
http://www.opensecrets.org/527s/527contribs.php
I think you may have misinterpreted the info at the site. It’s a list of top contributors to various 527 organizations.