One of the main problems in Michigan is the ignorance of large blocks of voters--see Detroit. A group could get a petition on the ballot to have forced unionization of all retirees, let's say. Using the class warfare arguments that are quite successful, this could be voted into the state constitution. Then what? Retirees are forced to pay 'dues' to the unions for nothing.
Think it's absurd? Through a deal with the last dem governor in Michigan, privately owned child care services were 'unionized'. Technically becoming state workers, they had millions of dollars stolen and sent to the unions. The Republican governor, Snyder, stopped it when he got in.