| Steve Smetana (Local - Racine County)
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| Steve's South Side (Corporation)
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| Steven Harvey For District Attorney
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| Stevens Point Fire Fighters IAFF Local 484 Fire PAC
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| Stiletto PAC
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| Stimsonite Corporation PAC
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| Stockbridge-Munsee Community
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| Stockbridge-Munsee Community (Corporation)
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| Stodola for Assembly
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| Straub for Sheriff Campaign (Ozaukee County)
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| Straub for Wisconsin
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| Strong Wisconsin
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| Stronger Wisconsin Fund
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| Stroud for Wisconsin
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| Stubhub (Corporation)
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| Students for Wisconsin
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| Sue Kolve's Salon & Day Spa (Corporation)
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| Sugar Creek Realty (Corporation)
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| Sullivan Campaign Committee
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| Sunovion Pharmaceuticals (Corporation)
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