It is none of our business how the Clintons as a family dealt with the Lewinsky affair. It is none of our business how Chelsea personally feels about the affair or how it has affected her relationships with Hillary and Bill. And in certain countries in Europe, for example, the affair would not have been a scandal, much less a grave matter of state, at all at the time and thus of even less import today. 

But this is America and, unfortunately, it did matter greatly--after all it led to perjury and impeachment--and therefore it does matter still.

Why?

Hillary is contending for the Democratic Party nomination for President of the U.S. If successful, she would represent the party in contention for the office itself. If successful once more, she would then represent the Democrat Party (as well as the whole nation), as a Democratic President. At each stage it is not only Hillary and those who unconditionally support her that are invested in her success. At a minimum, the rest of the party is invested, even those who may not support her. At a maximum, if she were to succeed, the entire nation and arguably the entire world is invested in her success.

In that context, then, Bill Clinton's sexual behavior is of vital importance. A new sex scandal during her nomination effort, her election campaign or her administration would have enormous impact. It would no doubt kill her nomination or election bids. It would cripple her administration, much as it crippled her own.

Setting aside the salacious nature and the aspects of it that are personal to the Clintons, why is it that a matter of such significant public import taboo?