And he opposed the California referendum, voted down in June, that would have barred unions from spending members' dues money on politics without their members' permission.

The measure would bar unions and corporations from running thinly disguised campaign advertisements within 30 days of a primary or 60 days before a general election.

The proposition would bar unions from using any part of an individual member's dues for political contributions without annual written permission from the member.

Another provision would bar unions and corporations - but not some advocacy groups - from running "issue ads" that mention a candidate 60 days before an election.

In his comments today, Mr. Bush also promoted a measure, long popular with Republicans, that would bar unions from making political contributions without their members' consent.

In the 2012 election, she is campaigning for California's Prop. 32 that would bar unions from withholding money from worker paychecks to finance political activities.

The Homestead plant completely barred unions until 1937.

Several corporations sought court orders today barring black unions from organizing work stoppages next week.