Stedman Graham shares the secret to his and Oprah Winfrey's decades-long romance

There's a very simple reason why Oprah Winfrey and Stedman Graham's relationship works.

On Friday's episode of The Ellen DeGeneres Show, Graham shares insight from his new book, Identity Leadership: To Lead Others You Must First Lead Yourself, and reveals the secret to his and Winfrey's 34-year romance.

"The thing about our relationship is I want the best for her," explains the 68-year-old author, who first met Winfrey in 1986 at a charity event. "So, I'm dedicated to her happiness, so that's great for her and I want her to be the best she can possibly be and she's done a pretty good job of doing it."

"For me, I've been able to find my own happiness, and develop my own skills, my own talents, my own abilities -- and I'm satisfied with that," Graham says of dating a powerful woman. "...So, the combination, when you have a good partner that's able to self-actualize their potential and you're able to self-actualize yours, one and one equals about six."

While Winfrey, 65, has insisted that she'll never run for president, Graham thinks she'd made a great political leader. "Oh yes, you can trust her, for one. She's smart, she has a photographic memory, she works very, very hard," he tells DeGeneres in endorsement of Winfrey running for office. "She has qualifications to do it and she's very successful."