"I think it's a genuine relationship that's motivated by real mutual respect and even love," Harris told CNN's "Late Edition."

"But there's no question they both like their own space," he explained. "She was often kind of crabby and irritable overseas when she had to travel with him. They jostle each other a little bit."

Harris isn't the first Clinton-friendly biographer to notice that Hillary often seems out of sorts.

"She is angry. Not all of the time. But most of the time," wrote Gail Sheehy for her 1999 book on the former first lady. One unnamed Clinton aide told Sheehy that her boss was "in a perpetual state of anger because of all she has absorbed."

Get the inside story on Mrs. Clinton's anger management problem in Ed Klein's new book, "The Truth About Hillary."

Editor's note:
Become a member of NewsMax’s "Land of the Free, Home of the Brave" Club – get the T-shirt – Click Here Now
Hillary’s White House Plans Unmasked! See Secret Story – Click Here Now!
Breaking: Dick Morris Says It’s Condi vs. Hillary in 2008 – Click Here Now

Read more on this subject in related Hot Topics:
Sen. Hillary Clinton