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By Andrew Osborn LONDON (Reuters) - British Prime Minister David Cameron's flagship gay marriage policy deepened a rift in his own party on Monday after many of his own lawmakers defied him in a sign of growing strains on his leadership and his coalition government. Almost 40 percent of Cameron's 303 lawmakers in the lower house of parliament voted for an ultimately unsuccessful amendment that would have allowed registrars to refuse to perform gay marriage ceremonies if they objected. ...