| Concerned Citizens of Fond du Lac
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| Concerned Officers & Employees
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| Concerned Realtors Committee
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| Concrete PAC (National Ready Mixed Concrete Assn)
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| Conley Campaign Account (Local-Janesville, WI)
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| Connor Management (Corporation)
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| Conquering Cancer PAC (Federal)
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| Conservative StrikeForce - Wisconsin Fund
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| Conservative Victory Fund PAC
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| Conservative Wisconsin
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| Conservative Young Professionals
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| Conservatives for Scott Walker
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| Conserve Wisconsin PAC
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| Consitution Party of WI (formerly US Taxpayers)
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| Constitution Party of Milwaukee
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| Constitution Party of Wisconsin
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| Construction PAC
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| Construction Trades Coalition
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| Consumer Financial Protection Advocacy Committee
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| Consumer Healthcare Products (CHPA-PAC) (Federal)
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