[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/POLITICS/04/26/souza.photos/art.obama.clinton.wh.jpg caption="President Obama and Secretary of State Hillary Clinton share a conversation on board Air Force One."]
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(CNN) - It's early April, and President Obama is on his way to France with the nation's top diplomat at his side. As he and Secretary of State Hillary Clinton converse in a private room aboard Air Force One, a photographer peers through the half-open door and snaps a candid picture of the formerly bitter campaign rivals.
Photographing two of the most powerful people in the country up-close and personal may seem like a once-in-a-lifetime opportunity to most Americans. But for photographer Pete Souza, it's a common occurrence.
"I try to photograph everything. Every meeting that the president does," Souza told CNN's John King on "State of the Union."
Watch: Portrait of a president
On leave of absence from his normal post as an assistant professor of photojournalism at Ohio University's School of Visual Communication, Souza is the chief official White House photographer for President Obama, meaning he has an all-access pass to the president's most intimate and private moments.
"I look at my job as a visual historian," Souza said on Sunday. "The most important thing is to create a good visual archive for history, so 50 or a hundred years from now, people can go back and look at all these pictures."
While he relishes his unobstructed seat to a historic administration, he knows his limits.