(Fox News) On the heels of the epic clash over collective bargaining in Wisconsin, labor groups in neighboring Michigan are launching an aggressive bid to erect a force-field around union benefits by enshrining their bargaining “rights” in the state constitution.

The union-backed campaign has business leaders and Republican lawmakers gearing up for an election fight. Unions are pushing to get their initiative on the November ballot and have submitted more than enough signatures to qualify.

The seemingly straightforward measure would call for a constitutional amendment creating a right to collective bargaining. But critics warn it could short-circuit and roll back, respectively, dozens of legislative proposals and existing laws — as well as prevent the state from ever passing a “right-to-work” law barring unions from demanding dues from employees.

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