
Wisconsin Gov. Scott Walker discusses his proposal to eliminate collective bargaining rights for many state workers in Madison, Wis., on Wednesday. Opponents are in their ninth day of protests. (Associated Press)

A police officer walks by someone sleeping at the state Capitol in Madison, Wis., Wednesday, Feb. 23, 2011, on the ninth day of protests against Gov. Scott Walker's plan to strip public sector workers of nearly all of their bargaining rights. (AP Photo/Andy Manis)

** FILE ** Wisconsin Gov. Scott Walker rehearses his "fireside chat" with voters at the state Capitol in Madison, Wis., on Tuesday, Feb. 22, 2011. (AP Photo/Andy Manis)

Opponents of Wisconsin Gov. Scott Walker's budget bill sleep in the Rotunda of the state Capitol in Madison, Wis., on Tuesday, Feb. 22, 2011. (AP Photo/Wisconsin State Journal, John Hart)

Opponents of Wisconsin Gov. Scott Walker's bill to eliminate most collective-bargaining rights for many state employees take part in their eighth day of protesting Tuesday at the state Capitol in Madison, Wis. Meanwhile, hundreds of miles away in Denver, union activists rallied in a show of support. (Associated Press)

Kathryn Schulze wears a message written on tape over her mouth inside the Wisconsin Capitol on Monday, Feb. 21, 2011, in Madison, Wis. Opponents of Gov. Scott Walker's bill to eliminate collective bargaining rights for many state workers are taking part on Tuesday in their eighth day of protests. (AP Photo/Jeffrey Phelps)

People rally on the Vermont Statehouse steps on Tuesday, Feb. 22, 2011, in Montpelier, Vt. Labor unions in the state are rallying in support of Wisconsin workers locked in a battle over collective bargaining rights. More than 300 people, including teachers, firefighters, nurses and other union members and supporters, turned out in bitter cold in Vermont's capital Tuesday for a rally supporting the workers balking at Wisconsin Gov. Scott Walker's plan. (AP Photo/Toby Talbot)

Protesters sleep inside the state Capitol on Tuesday, Feb. 22, 2011, in Madison, Wis. Opponents of Gov. Scott Walker's bill to eliminate collective bargaining rights for many state workers are taking part in their eighth day of protests. (AP Photo/Jeffrey Phelps)

Luke Balsavich holds a large sign outside the state Capitol on Monday, Feb. 21, 2011, in Madison, Wis. Opponents of Gov. Scott Walker's bill to eliminate collective bargaining rights for many state workers are taking part in their seventh day of protests. (AP Photo/Jeffrey Phelps)