SAN FRANCISCO -- The California Supreme Court will rule Tuesday on the validity of a voter-approved ban on same-sex marriage, a decision that will end months of speculation over whether gay couples can resume marrying in the state. The high court announced the pending opinion on its Web site Friday morning. Its seven justices are considering a series of lawsuits seeking to overturn Proposition 8 on the grounds that it was put on the ballot improperly. The constitutional amendment approved by voters in November overruled the court's 4-3 ruling from a year ago that briefly legalized same-sex unions. The court...