Sex, drugs and politics QUESTION

Here's a promise for you: I'm never running for elective political office. You never know what skeletons, or even perceived skeletons, might pop up. Well, maybe when I'm 70, when I will be able to honestly say, "I don't remember" when asked about my presumably sordid past.

I'm thinking about this because New York's NEW governor, David Paterson, is caught up in some sexual infidelity. Truth is, I don't much care because it's none of my business, and, unlike his predecessor, "I'm a f***ing steamroller" Spitzer, he hadn't set the morals bar so high that his affairs are major disappointments. Mostly because most people outside of Albany didn't even know who David Paterson was until a little over a week ago. In any case, he's likely to survive this politically because he would be succeeded by the Senate Majority Leader, who is a REPUBLICAN, Joe Bruno.

This begs the questions:
1) How much of a person's personal life should be open to the public when he or she is considering running for public office?
2) How far does one get to dig about someone's history and place as relevant? I recall that GWB said some years ago that he had not done certain drugs (cocaine, I believe) in the previous 25 years, answered in such a way that it suggested that perhaps he HAD used it earlier than that. As much as I dislike GWB politically - and I mean a WHOLE lot - I don't much care about an old drug bust.
ROG