Okay, so Bill couldn't legally run for president but he could be the vice-president part of, say, a Fiorina/Clinton ticket. However, shortly after the inevitable victory President Carly would suffer a debilitating, incumbancy-ending neck injury after accidentally 'falling' on Bill's penis while she was underneath his desk looking for a pearl necklace to go along with her golden parachute.
Then Bill would take control of the White House and make Donald Trump his VP, ensuring we'd never hear from that braying jackass ever again.