Rielle Hunter Interview: Elizabeth Edwards 'Not a Saint,' John Edwards 'Not a Demon'

Why did Rielle Hunter accept an invitation from John Edwards, a married man, to join him in his hotel room one fateful day in 2006?

"I went there because I believed I could help him," Hunter told "20/20's" Chris Cuomo in an exclusive interview.

Hunter reveals the details of her first meeting with the then-presidential candidate and the six-year affair that became the biggest political sex scandal of a generation in her bombshell tell-all, "What Really Happened: John Edwards, Our Daughter, and Me," to be published June 26. Hunter recently sat down with Chris Cuomo for her first interview since Edwards' acquittal on charges of accepting illegal campaign contributions.

In the book, Hunter writes that, as a budding spiritual advisor, she believed she could help him merge his public persona -- which she said appeared shallow and aloof -- with his deeper private persona, so that he could present himself more authentically.

Watch Chris Cuomo's interview with Rielle Hunter tonight on "20/20" at 10 p.m. ET.

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