Obama's campaign argues Ryan's budget could be a powerful campaign tool for the president in states like Pennsylvania and Iowa, in addition to Florida and Ohio.
Down ballot, party leaders hoped to work in tandem with Obama to turn the Ryan budget into a litmus test in congressional races, forcing Republican opponents to take ownership of the plan. The campaign arm of the House Democrats, for example, was urging its lawmakers to call Ryan's budget plan — not the man himself — Romney's new "running mate."
Thomas reported from Chicago. Associated Press writer Julie Pace contributed from Washington.
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