| Marathon Petroleum Corporation Employees PAC (Federal)
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| Marcelia for Milwaukee (Local-Milwaukee County)
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| Marcelia Nicholson for Milwaukee (Local-Milwaukee County)
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| Marcelle for Brown County Clerk (Local)
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| March On
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| March On PAC (Federal)
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| Marcia Fudge for Congress (Federal Candidate - Ohio)
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| Marcus Corp (Corporation)
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| Margo Miller for Assembly
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| Margo Miller for Columbia County Board (Local)
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| Marilyn Felderman-Baldwin (Individual)
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| Marilyn Townsend
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| Marinette County Democratic Party
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| Marinette County Republican Party
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| Marinette Marine Corporation PAC
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| Marion Naegle for County Clerk (Local-Holmen, WI)
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| Marion's List
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| Mark A Martello (Local-Tomahawk School District)
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| Mark Garthwaite for Assembly
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| Mark J Neu PT SC (Corporation)
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