Suppose John McCain had been in the White House in October 1962, facing one of the great tests of the modern presidency. If so, we might remember that period not as “the Cuban missile crisis” but as “World War III.”

As Mr. McCain demonstrated in Friday evening’s debate, he is a serious foreign policy thinker who has traveled widely, and he certainly showed vision and bipartisanship in helping to repair relations with Vietnam. But it’s equally clear that in recent years Mr. McCain has become impish cubed  impulsive, impetuous and impatient  and those are perilous qualities in a commander in chief.

Although he is frantically trying to distance himself from President Bush, Mr. McCain, by his own accounting, would be more Bushian in foreign policy than even Mr. Bush is now. While Mr. Bush has been forced to accept more sensible policies in his second term, Mr. McCain has become steadily more of a neocon in the cowboy role that Mr. Bush played in his first term, prone to solving problems with stealth bombers rather than United Nations resolutions.

Judging from Mr. McCain’s own positions, he might well revive a cold war with Russia and could start a hot war with Iran or North Korea. In those three hot spots, Mr. McCain could constitute a dangerous gamble for this country:

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Iran seems determined to continue its uranium enrichment and will be vexing for any president. But Mr. Bush, under the influence of Bob Gates and Condoleezza Rice, has realized that the best hope is diplomacy and negotiation. In contrast, Mr. McCain denounces Barack Obama’s call for direct talks with Iranian leaders and speaks openly about the possibility of bombing Iranian nuclear sites.