Several recent polls show Obama leading Hillary Clinton by a double-digit margin less than a week after the one-time front runner came in a disappointing third in the Iowa caucuses.

近期一些民调显示，继昔日领先者希拉里在爱荷华州党内预选屈居第三后的短短几天，奥巴马以双位数的支持率领先希拉里。

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More important, he has a double-digit lead in New Hampshire over John Kerry, the one-time front-runner, and is in a close race with Mr Gephardt in Iowa.

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Excluding these one-time events, the company said ad revenue would have grown in the "low single digit" percentages.

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State polls seem to have turned Mr Bush's way: according to new numbers from Gallup, for instance, he now has double-digit leads in both Missouri and Ohio, which he won last time, and a tiny one-point lead in Pennsylvania, which Al Gore won.

ECONOMIST: The presidential election