This article is almost more telling about John McCain than it is about Cindy - he didn't notice that his wife was addicted to drugs, he's been absent at the hardest times of her life, and then she goes out one day and adopts a baby all on her own and just walks in the door saying, "Hi honey, look what I bought today!" ?
If all of this doesn't SCREAM marriage of convenience, I don't know what does. Cindy's father wanted a political pawn to advance his business interests, she wanted to be First Lady, and Johnny wanted to be Prez...