Obama criticizes McCain for 'naive' foreign policy

Obama closed out his campaign day with a noisy rally in Sioux Falls before about 6,500 cheering backers, perhaps showing some of the strain of a long campaign day. "Thank you Sioux City," Obama said, as a roar greeted his entrance. He quickly corrected his reference to a nearby Iowa town.

"I've been in Iowa too long," said Obama, referring to his long campaign to win that state's leadoff caucuses in January.

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Associated Press writer Glen Johnson in Louisville, Ky., contributed to this report.