Guardian: John McCain's staunch opposition to gay marriage was one of the key parts of his presidential campaign. But it has become clear this was not supported in his own household. His daughter, Meghan, is a vocal advocate of gay rights. Now his wife, Cindy, has appeared in a poster campaign against California's proposition 8 - a law banning same-sex marriage. The move has shocked and delighted gay rights campaigners and led to questions about the state of the McCains' own marriage.