Even senior members of the administration seem astonished at the difficulty the president is having in selling the deal.
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President Obama’s most aggressive and sustained legislative push since the Affordable Care Act faces a crucial first test this week when a divided Senate considers a bill that would grant him accelerated power to complete a massive trade accord with 11 nations across the Pacific Rim.

But after lobbying members of Congress in a campaign that has included rides on Air Force One, meetings in the West Wing, private vows of political support and public attacks on critics in his own party, Mr. Obama’s top legislative priority remains at risk.