On a separate issue, Obama cracked a joke in Canada's direction.
He warned that Canada would continue to serve as a whipping boy in the highly charged U.S. debate over the future of health care, which has seen town hall meetings erupt into scuffles this summer.
Warnings about the danger of adopting "Canadian-style socialized medicine" are a ubiquitous refrain among critics of Obama's intended reforms.
"I suspect that you Canadians will continue to get dragged in by those who oppose reform - even though I've said nothing about Canadian health-care reform," Obama said.
"I don't find Canadians particularly scary, but I guess some of the opponents of reform think they make a good bogeyman."
Obama wants to extend health coverage to all Americans and allow for greater public-sector involvement alongside the current network of privately run insurance companies.
He said Americans are spending too much money on health care, with results that are too poor, and that too many families are being bankrupted by health bills because they don't have coverage.
But he quickly added that Canada's model - the single-payer public system - bears little relationship to the system he wants to create.
Obama repeated his frequent refrain that the U.S. health system evolved as a privately run entity over the decades, and there's no reason to move it in a radically different direction now.
But his legion of conservative critics argue that Obama's plan will ultimately kill the private insurance industry, increase government spending, and result in higher taxes. Just like Canada.
Harper steered clear of the debate.
When asked whether there were any elements of the Canadian system worth emulating, he merely replied: "Canadians support their own health-care system. As for the rest of this question my only answer is that this is an American debate, and the responsibility of the provinces."
Harper's obvious reluctance to sing the praises of Canada's medicare system stood in stark contrast to NDP Leader Jack Layton, who spent two days in Washington last June talking up Canadian health care with White House officials and members of Congress.
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