THE most audacious move of the race so far is also, potentially, the most self-destructive. John McCain’s choice of Sarah Palin as his running-mate has set the political atmosphere alight with both enthusiasm and dismay.

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The political calculations behind Mr McCain’s choice hardly look robust. Mrs Palin is not quite the pork-busting reformer that her supporters claim. She may have become famous as the governor who finally killed the infamous “bridge to nowhere”—the $220m bridge to the sparsely inhabited island of Gravina, Alaska. But she was in favour of the bridge before she was against it (and told local residents that they weren’t “nowhere to her”). As mayor of Wasilla, a metropolis of 9,000 people, she initiated annual trips to Washington, DC, to ask for more earmarks from the state’s congressional delegation, and employed Washington lobbyists to press for more funds for her town.

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The moose in the room, of course, is her lack of experience. When Geraldine Ferraro was picked as Walter Mondale’s running-mate, she had served in the House for three terms. Even the hapless Dan Quayle, George Bush senior’s sidekick, had served in the House and Senate for 12 years. Mrs Palin, who has been the governor of a state with a population of 670,000 for less than two years, is the most inexperienced candidate for a mainstream party in modern history.

Inexperienced and Bush-level incurious. She has no record of interest in foreign policy, let alone expertise. She once told an Alaskan magazine: “I’ve been so focused on state government; I haven’t really focused much on the war in Iraq.” She obtained an American passport only last summer to visit Alaskan troops in Germany and Kuwait. This not only blunts Mr McCain’s most powerful criticism of Mr Obama. It also raises serious questions about the way he makes decisions.