Union workers hold up signs during a rally outside the Capitol in Lansing, Mich., on Thursday, Dec. 6, 2012, as Republican lawmakers introduced right-to-work legislation in the waning days of the legislative session. (AP Photo/Carlos Osorio)

Photo by: Carlos Osorio

Union workers hold up signs during a rally outside the Capitol in Lansing, Mich., on Thursday, Dec. 6, 2012, as Republican lawmakers introduced right-to-work legislation in the waning days of the legislative session. (AP Photo/Carlos Osorio)