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Why is John Doe Chasing Scott Walker in Wisconsin?
The Supreme Court won't stop a state investigation into whether an outside group improperly coordinated activity with the governor's campaign in the 2012 recall election.

Scott Walker, governor of Wisconsin, speaks during the Conservative Political Action Conference (CPAC) in National Harbor, Maryland, U.S., on Thursday, Feb. 26, 2015.
Photographer: Andrew Harrer/Bloomberg