The Act 10 law ushered in under former Gov. Scott Walker is at the heart of a case before the court on whether UW Health nurses can form a union.
On Jill Underly's right is Brittany Kinser, a consultant for privatizing education through voucher programs, while the state's largest teachers union has recommended supporting Jeff Wright.
The move means the case will be taken up by a 4-2 liberal majority if it reaches the court, which appears all but certain.