Two lawsuits challenge Indiana's law that bars unions from requiring employees pay union dues.
Indiana unions added about 3,000 members in 2013, and the same number of nonmembers working in union shops.
A Lake County judge is the second judge to deem Indiana's ban on requiring union fees unconstitutional.
The Indiana Supreme Court plans to hear arguments Sept. 4 regarding the state's right to work law.
The controversial Right To Work law that passed two years ago brought thousands of jobs to the state, according to the Pence Administration.
Two Indiana University lawyers say the state Supreme Court is unlikely to agree with a lower court ruling that Indiana's right to work law is unconstitutional.
A Lake County superior court judge writes that the law requires unions to represent workers without just compensation.
Indiana union membership dropped 20 percent from 2011 to 2012, but union leaders say right to work is not the cause.
A federal court says the challenge against the law was not an issue of constitutionality.
Republicans charged Democrats thousands of dollars each in fines for walking out of the House of Representatives in 2011.