A referendum to ban gay marriage will definitely be on the ballot in California in November. What will the presidential candidates say? My guess: McCain will say he believes it’s good for voters in each state to decide, and that personally he’s against it. Obama? In his why-I-left-Trinity press conference, he cited his potential problem with a pastor who expressed an “aversion” to gays and lesbians. But I can’t imagine him coming out four-square personally in favor of same-sex marriage.