| Mark L Harris for County Executive (Local-Winnebago County)
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| Mark Neumann for Governor
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| Mark Pocan For Congress
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| Mark Vivian for Mayor (Local-Fitchburg, WI)
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| Marlene Johnson for Congress
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| Marquette Co Republican Party
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| Marquette County Democrats
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| Marquis Energy (Corporation)
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| Marschall4Congress (Federal Candidate)
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| Marshall & Ilsley PAC
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| Marshfield Local Fire Pac 1021 (Unregistered)
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| Marshfield Police Officer
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| Marstellar for Wisconsin
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| Martin F Stein Living Trust
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| Martin Law Office SC (Corporation)
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| Mary Lockwood For Wauwatosa (Local)
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| Mary Williams for 87th District Assembly
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| Maryann Zimmerman for Wisconsin State Assembly, District 31
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| Marylanders for Glendening (Out-of-state: Out-of-State)
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| Marysville Firefighters Local (Unregistered, Washington)
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