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Maryland Gov. Martin O’Malley called for an increase to the state’s minimum wage to at least $10 per hour during the legislative session that began last week.

As state lawmakers look to raise the wage above the federal minimum of $7.25 per hour, activists see alterations to the laws adopted regionally as potential land mines.

“It would create mischief,” Mr. Williams said. “It would detract from our efforts to pass a statewide minimum wage.”

NOTE: An earlier version of this report misidentified the deputy director of the D.C.-based Employment Justice Center. He is Ari Weisbard. The error has since been corrected.