SAN FRANCISCO — Proposition 8 supporters tossed another grenade at the judge who struck down the state’s gay marriage ban, saying in a motion today that former Chief Judge Vaughn Walker’s judgment should be vacated because he may have had a personal interest in the outcome.

Walker, who struck down the ban last year, is gay and in a long-term relationship. While he was silent about his personal life while hearing the case, he acknowledged his orientation in an interview with reporters earlier this month.