CHICAGO — A Minnesota judge this week kept alive a lawsuit filed by retirees against the state’s public pension funds that challenges legislation enacted earlier this year curbing benefit increases for current retirees.

At a hearing Wednesday, Ramsey County District Court Judge Gregg Johnson put off issuing a judgment in the case as requested by lawyers from the attorney general’s office, which is representing the defendants. The defendants include the state, the pension funds, their top managers, and Gov. Tim Pawlenty.

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