NEW YORK (Reuters) - Stock index futures were flat on Thursday amid uncertainty over U.S. fiscal negotiations, as President Barack Obama threatened to veto a controversial Republican plan, suggesting a deal wouldn't come as soon as many investors had hoped. Republican Speaker of the House John Boehner, in a brief press conference Wednesday, said his chamber would pass a proposal that spares many wealthy Americans from tax hikes needed to balance the budget. Obama has threatened to veto the plan if it passes, while some Republicans oppose any deal featuring tax increases. ...

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