It would not help him get elected, it would drag all the Clinton controversies into the general election, and having her down the hall in the West Wing would be a recipe for disaster, dissension and civil war. Other than that, it’s a hell of an idea!
Do read his analysis of her inability to bring additional votes to the Democratic ticket. He concludes:
Hillary would add no votes to Obama, she would dog his campaign with scandal, she would be disloyal in office, and her husband would be, at best, a huge distraction. Case closed.