Don't know whether I'd vote for them, but I'd see it as a plus.
First of all, I understand the argument that certain "personal" details of a candidate's life could be indicative of character flaws, etc. Obviously, it's gone way beyond that in this country.
However, if a politician was open and honest about past mistakes, possibly objectionable aspects of his lifestyle, etc, that is far more admirable on its own than using deception to appear "squeaky-clean", as you put it. Unfortunately, all you ever see is retrospective insincere "admissions" and "regrets" after somebody digs up their shit, and we're supposed to buy that as genuine, honest remorse? It's like the fucking Tiger Woods scandal: he's sorry because he got caught.
I don't care if you used to snort coke or shoot up: that has no bearing on whether or not you are fit for public office. Copious amounts of dishonesty and deception, however, are another story.
-J