NEW YORK -- Barack Obama will pay NBC and CBS almost $1 million each for the campaign's half-hour ad buy in primetime Wednesday, Oct. 29, less than a week before the election. According to papers available at CBS's headquarters in New York, the campaign agreed Monday to pay $961,000 for the entire 8-8:30 pm time period. It wasn't clear whether that was in pattern, meaning it would run across all time zones at that period.