President Barack Obama, in a last-ditch bid for a bipartisan "grand bargain" on the budget, threw his weight Tuesday behind a $3.7 trillion deficit-reduction plan unveiled by six Republican and Democratic senators.

The plan, which would span a decade, has scant chance of passing intact as the solution to the current debate over raising the government's borrowing limit. Some Republicans were wary of the plan's changes in tax rules. Democrats said it would be near impossible to draft legislative language and pass it quickly.

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