“I will seize any opportunity I can find to work with Congress to strengthen the middle class, improve their prospects, improve their security,” Mr. Obama said. But he added, “I’m not just going to sit back if the only message from some of these folks is no on everything, and sit around and twiddle my thumbs for the next 1,200 days.”

Addressing for the first time one of his most anticipated decisions, Mr. Obama said he had narrowed his choice to succeed Ben S. Bernanke as chairman of the Federal Reserve to “some extraordinary candidates.” With current fiscal policy measurably slowing the recovery, many in business and finance have looked to the Fed to continue its expansionary monetary policies to offset the drag.

Mr. Obama said he wanted someone who would not just work abstractly to keep inflation in check and ensure stability in the markets. “The idea is to promote those things in service of the lives of ordinary Americans getting better,” he said. “I want a Fed chairman that can step back and look at that objectively and say, Let’s make sure that we’re growing the economy.”

The leading Fed candidates are believed to be Lawrence H. Summers, Mr. Obama’s former White House economic adviser and President Bill Clinton’s Treasury secretary, and Janet Yellen, the current Fed vice chairwoman and another former Clinton official. The president said he would announce his choice “over the next several months.”

More clearly than he did in three speeches on the economy last week — the next is scheduled for Tuesday in Chattanooga, Tenn. — Mr. Obama in the interview called for an end to the emphasis on budget austerity that Republicans ushered in when they captured control of the House in November 2010.

The priority, he said, should be spending for infrastructure, education, clean energy, science, research and other domestic initiatives of the sort he twice campaigned on.

“I want to make sure that all of us in Washington are investing as much time, as much energy, as much debate on how we grow the economy and grow the middle class as we’ve spent over the last two to three years arguing about how we reduce the deficits,” Mr. Obama said. He called for a shift “away from what I think has been a damaging framework in Washington.”