When you lose George Will...

Under the pressure of the financial crisis, one presidential candidate is behaving like a flustered rookie playing in a league too high. It is not Barack Obama.

Channeling his inner Queen of Hearts, John McCain furiously, and apparently without even looking around at facts, said Chris Cox, chairman of the Securities and Exchange Commission, should be decapitated. This childish reflex provoked the Wall Street Journal to editorialize that "McCain untethered" -- disconnected from knowledge and principle -- had made a "false and deeply unfair" attack on Cox that was "unpresidential" and demonstrated that McCain "doesn't understand what's happening on Wall Street any better than Barack Obama does."

To read the Journal's details about the depths of McCain's shallowness on the subject of Cox's chairmanship, see "McCain's Scapegoat" (Sept. 19, Page A22). Then consider McCain's characteristic accusation that Cox "has betrayed the public's trust."

Perhaps an old antagonism is involved in McCain's fact-free slander. His most conspicuous economic adviser is Douglas Holtz-Eakin, who previously headed the Congressional Budget Office. There he was an impediment to conservatives, including then-Rep. Cox, who, as chairman of the Republican Policy Committee, persistently tried and generally failed to enlist CBO support for "dynamic scoring" that would estimate the economic growth effects of proposed tax cuts.

In any case, McCain's smear -- that Cox "betrayed the public's trust" -- is a harbinger of a McCain presidency. For McCain, politics is always operatic, pitting people who agree with him against those who are "corrupt" or "betray the public's trust," two categories that seem to be exhaustive -- there are no other people. McCain's Manichaean worldview drove him to his signature legislative achievement, the McCain-Feingold law's restrictions on campaigning. Today, his campaign is creatively finding interstices in laws intended to restrict campaign giving and spending.

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Conservatives who insist that electing McCain is crucial usually start, and increasingly end, by saying he would make excellent judicial selections. But the more one sees of his impulsive, intensely personal reactions to people and events, the less confidence one has that he would select judges by calm reflection and clear principles, having neither patience nor aptitude for either.

It is arguable that, because of his inexperience, Obama is not ready for the presidency. It is arguable that McCain, because of his boiling moralism and bottomless reservoir of certitudes, is not suited to the presidency. Unreadiness can be corrected, although perhaps at great cost, by experience. Can a dismaying temperament be fixed?