The order is all the more remarkable because it bluntly rejects the prosecutor’s theory of illegal coordination between the groups and the Walker campaign. Wisconsin’s campaign finance statutes ban coordination between independent groups and candidates for a “political purpose.” But a political purpose “requires express advocacy,” the judge wrote, and express advocacy means directly advocating the election or defeat of a candidate.

“There is no evidence of express advocacy” and therefore “the subpoenas fail to show probable cause that a crime was committed,” Judge Peterson wrote. Even “the State is not claiming that any of the independent organizations expressly advocated” for the election of Mr. Walker or his opponent, he added. Instead they did “issue advocacy,” which focuses on specific political issues.

This means that prosecutors essentially invented without evidence the possibility of criminal behavior to justify the subpoenas and their thuggish tactics. At least three targets had their homes raided at dawn, with police turning over belongings, seizing computers and files, and even barring phone calls.