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I think Edwards spent his life climbing the ladder and being the perfect person, the perfect husband and father and attorney. Along comes Hunter, with her past that must have seemed glamorous to Edwards and her new age spiritualism and he sees it as a path to a new him.
Not only is Edwards going through midlife but, he lost his son, his wife was sick and he lost the vice presidency. He did it all the button down way.
And probably felt something missing.
she may have represented the free spirit he wished he could be.
And atone for regrets like his war vote when he was button down DLC guy.
It may have been this that spurred him to publicly rebuke his war vote and go for the more populist thinking. Become more of the old populist guy of the past, of the 30s that he wanted to revive.
I personally think she may have been more to him on a personal and emotional level then as much sexual.