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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.

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

The U.S. Supreme Court refused on Monday to end a state criminal investigation into whether a conservative group improperly coordinated with Wisconsin Governor Scott Walker’s 2012 recall campaign.

The investigation, still on hold, could complicate Walker’s potential campaign for the Republican presidential nomination. A ruling from the Wisconsin Supreme Court on whether the investigation should be restarted could arrive just before or after he announces his decision about a bid, something he's suggested would come in June or July.