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Ms. Banister said the decision was solely a scheduling issue and not because Ms. O'Donnell wasn’t prepared to go on the programs.

However, the cancellations reflect a campaign of about six staffers trying to keep up after being thrust into the national spotlight. Ms. Banister said many requests are pouring in and the campaign needs a scheduler and additional aides.

Separately, “Face the Nation” host Bob Schieffer said that program received an e-mail Saturday morning canceling Ms. O'Donnell’s appearance without explanation. But the campaign later called to say that Ms. O'Donnell had some campaign events.

“I can’t remember when anybody has canceled on us on a Saturday, but there’s always a first,” he said. “If she can work it in sometime, we’ll be happy to have her.”