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Photo by: Jeffrey Phelps

FILE - In this May 3, 2014, file photo, Wisconsin Republican Gov. Scott Walker speaks in Milwaukee. Newly released documents show prosecutors are alleging Walker was at the center of a nationwide "criminal scheme" to illegally coordinate with outside conservative groups. The documents were filed as part of an ongoing lawsuit challenging the probe by the conservative group Wisconsin Club for Growth. The documents were ordered publicly released Thursday, June 19, 2014, by a federal appeals court judge after prosecutors and the Wisconsin Club for Growth did not object. (AP Photo/Jeffrey Phelps, File)

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