Packer compares the candidates' temperaments:

Obama’s character is a political triumph. His cool, unlike McCain’s tic-filled anger, is tactically deployed; throughout the campaign it’s become his main weapon against crisis and attack. But if he wins, he’ll need to play far more of his psychic register to have any chance of succeeding at the impossible job he’s so skillfully pursued. He’ll have to draw on humor, on empathy, on audacity, on courage, in order to inspire the kind of confidence the country badly lacks and needs. He might even have to get angry.

My column last week focused on Obama's preternatural calm.

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