WASHINGTON — House Speaker John A. Boehner abruptly canceled a vote on his Plan B tax proposal late Thursday after failing to find enough GOP support, a stunning political defeat that effectively turned resolution of the year-end budget crisis over to President Obama and the Democrats.

The speaker had spent the last few weeks negotiating one-on-one with the president, establishing himself as the second-most powerful figure in Washington. But with his strategy imploding, Boehner conceded that he would play a lesser role.

“Now it is up to the president,” he said, to work with a fellow Democrat, Senate Majority Leader Harry Reid of Nevada, “to avert the fiscal cliff.”

The proposal the speaker had hoped to bring to a vote would have prevented a year-end tax increase for all but those earning more than $1 million a year.

But the Ohio Republican said in a statement, “It did not have sufficient support from our members to pass.”

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