Among the top five employers here are the county, the schools and the city. And that was enough to make Mr. Hahan, a union man from a union town, a supporter of Gov. Scott Walker’s sweeping proposal to cut the benefits and collective-bargaining rights of public workers in Wisconsin, a plan that has set off a firestorm of debate and protests at the state Capitol. He says he still believes in unions, but thinks those in the public sector lead to wasteful spending because of what he sees as lavish benefits and endless negotiations.

“Something needs to be done,” he said, “and quickly.”

Across Wisconsin, residents like Mr. Hahan have fumed in recent years as tens of thousands of manufacturing jobs have vanished, and as some of the state’s best-known corporations have pressured workers to accept benefit cuts…

There are deeply divided opinions and shifting allegiances over whether unions are helping or hurting people who have been caught in the recent economic squeeze. And workers themselves, being pitted against one another, are finding it hard to feel sympathy or offer solidarity, with their own jobs lost and their benefits and pensions cut back or cut off.