Debbie Nault from the Michigan Nurses Association stands with other members of the association on the state Capitol steps in Lansing, Mich., Monday, Dec. 10, 2012, protesting right-to-work legislation. Organizers say the gathering was meant to symbolize the silencing of unions that nurses say will happen should the legislation become law.(AP Photo/Carlos Osorio)

Members of the Michigan House Democrats and supporters stand in the office of House Democratic Leader Rick Hammel, center, in Lansing, Mich., Monday, Dec. 10, 2012, to denounce the state's right-to-work legislation which was passed last week in Lansing. (AP Photo/Carlos Osorio)

Michigan House Democratic Leader Elect Tim Greimel, right, and current House Democratic Leader Rick Hammel, left, meet with the media, in Lansing, Mich., Monday, Dec. 10, 2012, to denounce the state's right-to-work legislation which was passed last week in Lansing. (AP Photo/Carlos Osorio)

Linda Erspamer a veteran nurse of more than 30 years at Sparrow Hospital in Lansing, stands with other dozen members of the Michigan Nurses Association on the state Capitol steps in Lansing, Mich., Monday, Dec. 10, 2012, protesting right-to-work legislation. Organizers say the gathering was meant to symbolize the silencing of unions that nurses say will happen should the legislation become law.(AP Photo/Carlos Osorio)

Members of the Michigan State Police, background, look on as about a dozen members of the Michigan Nurses Association stand on the state Capitol steps in Lansing, Mich., Monday, Dec. 10, 2012, protesting right-to-work legislation. Organizers say the gathering was meant to symbolize the silencing of unions that nurses say will happen should the legislation become law.(AP Photo/Carlos Osorio)

About a dozen members of the Michigan Nurses Association stand on the state Capitol steps in Lansing, Mich., Monday, Dec. 10, 2012, protesting right-to-work legislation. Organizers say the gathering was meant to symbolize the silencing of unions that nurses say will happen should the legislation become law.(AP Photo/Carlos Osorio)

People begin gathering outside on the State Capitol grounds in Lansing, Mich., Tuesday, Dec. 11, 2012 to protest right-to-work legislation that was passed by the state legislature last week. Michigan will become the 24th right-to-work state, banning requirements that nonunion employees pay unions for negotiating contracts and other services. (AP Photo/Carlos Osorio)

Thousands of protesters gather for a rally on the State Capitol grounds in Lansing, Mich., Tuesday, Dec. 11, 2012. The crowd is protesting right-to-work legislation that was passed by the state legislature last week. Michigan will become the 24th right-to-work state, banning requirements that nonunion employees pay unions for negotiating contracts and other services. (AP Photo/Carlos Osorio)