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Susan Walsh, Associated Press
President Barack Obama listens during a meeting of the President's Council on Jobs at the International Brotherhood of Electrical Workers (IBEW) Local No. 5 Training Center in Pittsburgh, Tuesday, Oct. 11, 2011.

WASHINGTON — President Barack Obama says the Senate faces a "moment of truth" as it prepares to vote on his $447 billion jobs bill.

The president says the economy needs a jolt right now, and the Senate has a chance to do something about it.

Nonetheless, the measure is expected to go down to defeat in the Senate late Tuesday, largely because of Republican opposition to stimulus spending and a new tax on millionaires.

Obama spoke in Pittsburgh hours before the vote. Earlier he said he's prepared to break his bill up into separate parts and move it that way if Congress doesn't pass it in its entirety.