Sadly, I think the question is more complex than that. How do you, assuming you've gone for the "side of good" (and we won't dig into that), ensure the continuity of your rule for the "side of good"? How do you keep the Bill, or for that matter Hillary, Clintons from taking over?
Perhaps the problem is in the word "rule." A policeman doesn't "rule" his beat, but he can work to maintain civil order in it. If we're careful to make that distinction, we can tell when a President Clinton is crossing the line.