Washington (CNN) - Nearly six in ten union workers say they're backing President Barack Obama in November's general election, according to a new national survey.
A Gallup poll released Monday indicates that 57% of registered union workers say they support Obama, with 35% saying they back Republican presidential challenger Mitt Romney.
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According to the survey, 44% of non-union workers say they'll support the president, with 48% saying they'll back Romney, the former Massachusetts governor and presumptive GOP nominee. The poll indicates that union workers make up about 12% employed voters.
The numbers are not a surprise, as union workers historically have backed Democratic candidates for president. According to CNN national exit polls from the 2008 election, Obama beat Sen. John McCain 61%-38% among union workers, who made up 11% of the vote.
Unions and politics were a major topic last week in Wisconsin, where organized labor battled unsuccessfully to oust Republican Gov. Scott Walker in a recall election. Walker and GOP state lawmakers last year pushed through a measure that put restrictions on collective bargaining rights for public sector union workers.
The Gallup survey was part of Gallup's Daily Tracking poll, with 13,376 employed registered voters questioned by telephone from April 11-June 5. The poll's overall sampling error is plus or minus one percentage point, and a sampling error of plus or minus four percentage points for questions only of union workers.
CNN Political Editor Paul Steinhauser contributed to this report