In early 2011, pro-union activists raised a ruckus at the Wisconsin statehouse. They were raging in opposition to Gov. Scott Walker’s public-sector union reforms. The laws passed, and Walker survived a subsequent union-led recall effort. But the real question of who won that fight may be decided in Michigan this month.

That’s because state Republican leaders there are mulling whether to join Wisconsin’s union reform push with a state “right-to-work” law. Republicans control the governorship and both houses of the legislature — and by most accounts, they have the votes.