| Carpenters Local 310
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| Carpenters Local 344
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| Carpenters Local 361 (Unregistered-Minnesota)
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| Carriage Healthcare Companies (Corporation)
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| Carrig for Congress
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| Casters PAC
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| Catalysts for Science Policy (Unregistered)
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| Caterpillar Inc Employee PAC
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| Caterpillar Inc Political Action Committee -CATPAC (Federal)
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| Catherine Cleary
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| Catherine Emmanuel for Council (Local-Eau Claire, WI)
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| CatholicVote.org Candidate Fund
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| Cavalier for Milwaukee (Local-Milwaukee, WI)
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| CCC of Pewaukee - Crossroads Care Center (Corporation)
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| CD5 Committee (Unregistered)
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| Cecil Kippenahn (Individual)
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| Cedar Creek Coalition
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| Cedar Grove Warehousing (Corporation)
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| Cedar Lake United Educators
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| Cedar River Potato Co (Corporation)
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