The federal law banning gay marriage is unconstitutional because it interferes with the right of a state to define the institution and therefore denies married gay couples some federal benefits, a federal judge ruled Thursday in Boston.

U.S. District Judge Joseph ruled in favor of gay couples' rights in two separate challenges to the Defense of Marriage Act, known as DOMA, a 1996 law that the Obama administration has argued for repealing. The rulings apply to Massachusetts but could have broader implications if they're upheld on appeal.

The state had argued the law denied benefits such as Medicaid to gay married couples in Massachusetts, where same-sex unions have been legal since 2004.

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