Those states with the most unionized workforces don't always have the most generous public-worker pensions, and ending collective-bargaining rights -- as in Wisconsin -- isn't likely to end budget problems, a study says. Further, research indicates that most states have woefully underestimated their pension obligations, meaning more will have to look at the size of their public workforce and employee benefits commitments, experts say. Union officials dispute the claims, saying the issue has become too politicized.

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