Justices weigh assisted suicide: "It is difficult to predict how a case will be resolved based on oral arguments. But O'Connor could be the deciding vote, which raises the possibility that the case might have to be re-argued." (Emphasis added. Source: Yahoo! News)
Something I have long wondered about in reports of the US Supreme Court is: If each justice's opinion carries the same weight as the other opinions, how can one be the deciding vote.
O'Connor is often labeled the "swing vote" and I always thought this alluded to that she showed little or no political bias.