SAN FRANCISCO -- A lawyer for two couples challenging California's gay marriage ban told a federal judge in San Francisco on Friday that two rulings by another U.S. judge in Boston Thursday provide "compelling support" for their case.

Attorney Theodore Olson made the argument in a letter to U.S. District Judge Vaughn Walker.

Walker is presiding over a nonjury trial in which two gay and lesbian couples claim Proposition 8, California's voter-approved ban on same-sex marriage, violates their federal constitutional rights.

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