They probably don't know each other at all. How much time do you think they actually spend together?
Given that he married her for her money, she surely couldn't have married him for his looks. I'm still trying to figure that one out. He got money but what exactly is she getting out of this deal - proximity to power (or some facsimile thereof)?
I think she got in the political groove via her first husband, a Republican. She just changed her name and her political affiliation last year (and sold her Italian mansion, one of eight) to be ready for Kerry's run. It looks to me like she doesn't enjoy this at all and is a reluctant nominee's wife. Seeing her on Larry King made that quite clear, to me anyway.