Dude, I'm not going to say Bill is dumb, but I seriously doubt the driven part. I think he'd have been perfectly happy as a law professor boinking his female students.
Hilary is the one that wants power.
Note...i voted against bill every chance i got and am not a supporter. That said...
Bill is a masterful retail politician. I have seen it first hand. Dude genuinely loves working a crowd and eating up their adulation. And the amount of effort required to win a state or nation is beyond most folks ken. A man might fake it for a while but keeping it up all the way through is very unlikely.
Hillary has always been a net loss for bill in electoral contests. She costs him votes he might have had. He keeps her around for other reasons.
Wanna see a politician just as driven and smart but without the charisma and love of working a crowd retail? See ted cruz. Or hillary clinton.
Do not fall for the baloney narrative. Bill is either the number one or number two american politician in the last century. Part of his success is hiding the crass ambition that is obvious in most.