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.
"Working families, the unemployed and the impoverished faced numerous assaults in the continuing drive to make the rich richer," said the state AFL-CIO.
A week of statewide teacher protests in California included the arrest of 26 members of the California Teachers Association.
AFL-CIO President Richard Trumka said he supports unions taking an independent political approach in their fight to build the power of workers.
Tens of thousands of workers and their supporters have hit the streets circulating petitions to put the measure to repeal Senate Bill 5 as a referendum on the November ballot.
Labor leaders, while endorsing the president's budget deficit speech, say job creation will need to be addressed if the long-term fiscal health of the nation is to be restored.
As rallies, town hall meetings and teach-ins spread throughout the state up to 10,000 Ohioans converged on the Statehouse Tuesday to protest a Republican bill to repeal public employees' right to bargain collectively.