Were the marriages they presided over legal whereever they did it?They should recuse themselves. By the act of officiating a same sex marriage they have indicated a predisposition to uphold same sex marriage due to a personal opinion and not decide on the law before them.
Not only were they legal, they are not in jurisdictions which would have a case before the court - Maryland passed SSCM by voter ballot and DC by legislative action. In neither case was the Civil Marriage ceremony performed in a jurisdiction in which SSCM was overturned by a federal court.
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