Less than a year after the Legislature passed a law authorizing casinos in Massachusetts, one awkward but significant compromise in the bill is already becoming untenable. The new law gives an Indian tribe — in practice, the Mashpee Wampanoag — a head start in the competition for the single casino license in Southeastern Massachusetts. But as the tribe and Beacon Hill leaders work to put that provision into practice, they’re risking years of limbo and legal wrangling.

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