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Because a veto would have to clear both congressional chambers, the bill appears doomed.

Still, Democrats have hope for a veto override.

Senate Democrats say they are one vote shy of reaching a two-thirds majority, and have targeted several potential crossover voters, particularly Sen. John E. Sununu, New Hampshire Republican.

A successful veto override in the Senate, as the bill’s originating chamber would vote first, could inspire reluctant House members to do the same, said Senate Majority Leader Harry Reid, Nevada Democrat.

The House voted a day after three teams of scientists announced they had produced the equivalent of embryonic stem cells in the skin of mice without destroying embryos.