| J Thomas Haley
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| Jack Eckblad for Milwaukee (Local-Milwaukee County)
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| Jack Riley for Senate
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| Jackson (Unregistered-Type of Committee Unknown)
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| Jackson County Democratic Party
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| Jackson County Republican Party
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| Jackson County Tavern League
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| Jacob Luginbuhl for Wisconsin
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| Jacob Searls Cranberry Co (Corporation)
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| Jacobs Injury Law (Corporation)
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| Jacobson for Assembly
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| Jacque for Senate
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| Jadin For Mayor (Local-Green Bay)
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| Jag Courts Inc - JustAgame Fieldhouse (Corporation)
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| Jaime Harrison for US Senate (Federal Candidate-South Carolina)
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| James Johnson for Assembly
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| James Peterson Sons (Corporation)
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| Jan Michalski for Alderman (Local-City of Kenosha
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| Jane Fonda Climate PAC (Federal)
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| Janesville Firefighters For Better Government
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