The reluctance of groups like the American Farm Bureau Federation and the National Pork Producers Council to get behind the measure threatens to kill it in the Senate, according to some political analysts. On Friday, the House passed legislation, 219-212, setting up a mandatory nationwide cap on greenhouse gases.

"Agriculture can in effect hold this bill hostage," said Barry Rabe, a public policy professor at the University of Michigan. "This suggests we're only at the beginning of the negotiating process."

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