Historian Makes The Case For Same-Sex Marriage Bob Egelko, Chronicle Staff Writer Tuesday, January 12, 2010 SAN FRANCISCO -- A Harvard professor made a historian's case for same-sex marriage in federal court today, saying defenders of California's Proposition 8 are using the same rationale that was offered against interracial unions and equal rights for wives - that the survival of marriage itself was at stake. Those who supported prohibitions on weddings across racial lines, bans dating from colonial days that the Supreme Court abolished only in 1967, often argued that "the institution would be degraded, their own marriages would be...