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Meanwhile yesterday, Mr. McCain called for talks with China to negotiate a temporary halt to production of nuclear-weapons-grade material.

“We should also begin a dialogue with China on strategic and nuclear issues,” he said. The goal would be to encourage China to conform to the practices of the other four nuclear powers recognized by the Non-Proliferation Treaty, “including working toward nuclear arsenal reductions and toward a moratorium on the production of additional fissile material.”

The senator from Arizona also said the United States should “enter into a new arms control agreement with Russia reflecting the nuclear reductions I will seek.”

In response, the Obama campaign said, “By embracing many aspects of Barack Obama’s nonproliferation agenda today, John McCain highlighted Obama’s leadership on nuclear weapons throughout this campaign.”

Mr. McCain’s speech in Denver was interrupted four times by demonstrators opposing his support of continued military involvement in Iraq. Each time, the protesters were escorted out and the several hundred people in attendance tried to shout them down by chanting Mr. McCain’s name.

Mr. McCain grew increasingly irritated and then used the opportunity to press his case against withdrawing U.S. troops from Iraq.

“This may turn into a longer speech than you had anticipated,” Mr. McCain said. “And by the way, I will never surrender in Iraq, my friends.” He received a standing ovation before continuing his nonproliferation remarks.

Mr. Obama also encountered some difficulty in his New Mexico speech. He said his uncle was “part of the first American troops to go into Auschwitz and liberate the concentration camps.”

In fact, Soviet troops liberated Auschwitz, and Mr. Obama’s campaign later clarified that the candidate had meant to say Buchenwald, which American troops liberated in April 1945.