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there are today three types of PACs: The first is “separate segregated funds” (SSFs) that are attached to corporations and unions, and which may solicit contributions only from employees, stockholders, owners, or members. Major corporations such as Ebay and Microsoft, as well as large unions like the AFL-CIO typically have SSFs. The second is “non-connected” PACs that are not affiliated with a corporate or labor interest, and that solicit contributions from the public at large in support of a common value. For example, EMILY’s List, whose name is an acronym for “Early Money Is Like Yeast,” helps women candidates “rise” by providing them with funding to jumpstart their campaigns. EMILY’s List may accept contributions from anyone willing to donate to the cause. Finally, “leadership PACs” are established by federal officeholders to help other candidates get elected. When members of Congress do not face a strong challenge in their own reelection campaigns, for instance, they can channel part of their war chest to other candidates via a Leadership PAC.
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Conor M. Dowling (Super PAC!: Money, Elections, and Voters after Citizens United (Routledge Research in American Politics and Governance))