President Barack Obama walks to board Air Force One at Buckley Air Force Base.
Kathryn Dunn Tenpas, who studied presidential travel for the Brookings Institution, said it's difficult to draw a clear division.
"The office is inherently political," she said. "I'm not sure how you would ever separate the political from the presidential."
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Associated Press writer Jack Gillum contributed to this report.
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EDITOR'S NOTE _ An occasional look at how Washington works behind the scenes.
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