Why? Because he'd be #2 in the White House, he'd actually be living with Hillary for the first time in years and because he won't be getting any poo-tang.
Bill Clinton can't want Hillary to be elected. There is no upside for him. He has only so many viagra years left.
But Presidents are always surrounded by people and press. They also send their wives off on diplomatic and PR trips around the world. It's a dream come true for Willie. He can launch his "Getting To Know You" college tour.