WASHINGTON (Reuters) - Republican lawmakers delivered a stinging rebuke to their leader, House of Representatives Speaker John Boehner, on Thursday when they failed to back an effort designed to extract concessions from President Barack Obama in year-end "fiscal cliff" talks. The dramatic twist threw into disarray attempts to head off $600 billion worth of indiscriminate tax hikes and spending cuts that could push the U.S. economy into recession next year. It also cast doubt over Boehner's future as speaker after failing to control unruly conservatives in his caucus. ...

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