WASHINGTON - The U.S. House of Representatives sidetracked a high-profile White House-backed trade bill, a blow to a pending Asian trade deal and a humiliating defeat for President Barack Obama inflicted by members of his own party.

The 302-126 vote Friday leaves the trade legislation in perilous limbo and came a few hours after Obama journeyed to Congress to deliver a last-minute personal plea to fellow Democrats. The measure would allow him to negotiate global trade deals, including one with 11 Asian nations near completion, that Congress could approve or reject but not change.

The debate and vote are certain to reverberate in next year's presidential election. Most Republican contenders favor the trade bill. Among Democrats, Hillary Clinton is uncommitted, despite calls by rivals to take a position.

Business groups generally favor the measure. But strong opposition by organized labor carries at least an implicit threat to the re-election of any Democrat who votes in the bill's favor.

"Slow down the fast track to get a better deal for the America people," Democratic House Leader Nancy Pelosi said in a speech that drew handshakes and hugs from union-backed Democrats who have labored for months to reject Obama's request for "fast track" authority in trade talks.

Obama drew applause when he walked into the meeting with Democrats, but sharp words after he left and few if any conversions for his efforts.

The president's hastily arranged visit to Congress marked a last-minute bid to stave off a stinging defeat at the hands of his own party.

His visit relegated much of the debate on the House floor to the status of a sideshow. (AP)