The AFL-CIO said it has registered more than 450,000 new voters from union households in a bid to help President Barack Obama win reelection.
The tally includes about 68,000 new voters in Ohio, one of the most contested battleground states this year. The labor federation registered thousands of other union-friendly voters in swing states like Colorado and Nevada.
Voters from union homes have traditionally favored Democratic candidates. Exit polls show 59 percent of voters who lived in union households backed Obama in 2008, while 39 percent supported Republican John McCain.
That trend is expected to continue this year in light of high-profile efforts by Republican leaders to weaken collective bargaining rights in Ohio, Wisconsin, Indiana and other states.