This piece in the State (h/t RCP) on Sanford’s mental state reads a little like a parody:

Psychiatrists, psychologists and other professionals who work with behavior disorders were reluctant to diagnose Sanford based on what they have seen on television or read in newspapers.
But a few were willing to offer theories as to what could be driving the governor’s behavior.
Susan Hardwicke, a licensed social worker who runs a clinical practice in Columbia, said Sanford could be under the influence of brain chemicals that fire when a person falls in love.
“People do crazy things for love,” Hardwicke said. “That’s what all the songs are about. Nobody in their right mind would do what he’s doing.”
This behavior is temporary, she said. Research shows romantic love lasts less than two years. (Sanford’s term as governor has 18 months remaining.)