| Consumer Lending All (Unknown/Unregistered)
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| Consumer Safety Technology dba IntoxaLock (Corporation)
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| Consumer Technology Association (Corporation)
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| Continental Casualty Company (Corporation)
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| Cooperative Network Direct Givers Fund (Conduit)
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| Cooperative Outreach for Objective Politics
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| Coos County Democrats (Out-of-state party: Oregon)
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| Copart Salvage Auto Auctions (Corporation)
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| Cops for Justice Fund (Independent Expenditure Committee)
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| CoRe PAC - Commercial Real Estate of Wisconsin PAC
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| CoreCivic (Corporation)
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| Corn PAC
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| Cornellier Fireworks (Corporation)
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| Corrections Corp of America
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| Corridor 29 PAC
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| Corrigan for Senate 24 (Federal Candidate)
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| Cory Tomczyk, for Senate
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| Cottonwood Financial Administrative Services LLC dba Cash Store (Corporation)
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| Council 10 PAC
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| Count on Supreme (Local-Milwaukee County)
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