The third big front in the right-wing Republican-business state-by-state war on workers, in Missouri, ended when the state legislature adjourned in May.
A bill to make it easier for California's 400,000 farmworkers to choose a union passed both houses of the California Legislature.
The Republicans are facing the recalls because of their support for Gov. Walker's bill killing collective bargaining rights for public workers.
Delegates to the convention of the National Education Association will vote on whether to immediately endorse Democratic President Barack Obama for re-election.