Very long, but very good rundown. Excerpt:

We expect that some of our readers are angry that we’re raising these matters. Good. You should be angry that anybody would raise John McCain’s wife’s addiction to painkillers, or a supermarket tabloid report about George and Laura Bush’s marriage. It is, as David Broder once wrote, no way to pick a president.

But if you’re angry about this, you should be far more angry that for years, the media has employed a double-standard in covering progressives and conservatives. You constantly hear about the Clintons’ personal lives on television; you read about it in the newspaper. John McCain doesn’t get the same treatment; nor does George Bush or Rudy Giuliani. Intrusive, irrelevant tabloid-style coverage of candidates is wrong. Intrusive, irrelevant tabloid-style coverage of some candidates, while others are afforded an appropriate zone of privacy is even worse. And it can’t go on.