FILE - In this Nov. 8, 2012 file photo, opponents cheer at a Cleveland rally as they hear election results sounding the defeat of an anti-union measure in Ohio. Unions spent $24 million to overturn the measure in Ohio, only to lose their effort to recall Wisconsin Gov. Scott Walker the following June. Blindsided by a new law weakening union rights in Michigan, organized labor is preparing to target Republican governors in politically important states up for re-election in 2014. (AP Photo/Amy Sancetta, File)

Associated Press
FILE - In this Nov. 8, 2012 file photo, opponents cheer at a Cleveland rally as they hear election results sounding the defeat of an anti-union measure in Ohio. Unions spent $24 million to overturn the measure in Ohio, only to lose their effort to recall Wisconsin Gov. Scott Walker the following June. Blindsided by a new law weakening union rights in Michigan, organized labor is preparing to target Republican governors in politically important states up for re-election in 2014.  (AP Photo/Amy Sancetta, File)
FILE - In this Nov. 8, 2012 file photo, opponents cheer at a Cleveland rally as they hear election results sounding the defeat of an anti-union measure in Ohio. Unions spent $24 million to overturn the measure in Ohio, only to lose their effort to recall Wisconsin Gov. Scott Walker the following June. Blindsided by a new law weakening union rights in Michigan, organized labor is preparing to target Republican governors in politically important states up for re-election in 2014. (AP Photo/Amy Sancetta, File)
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