VP's daughter does coke? Where's the beef?

http://www.nypost.com/seven/03282009/news/nationalnews/friend_of_bidens_daughter_shopping_tape__161772.htm
Last week, the NY Post was the first major publication to claim that it had seen a videotape of Vice President Biden's doing coke at a party. Though the paper opted not to purchase the tape, which was being sold by an apparent former friend of Biden's, it still ran the story saying that she was using the drug.

Is this newsworthy? Is the VP's daughter's abuse of drugs worth being reported on? In short, yes, of course.

But what kind of source is this to rely on as a crutch? And if the tape wasn't worth buying, why was the story worth printing?

For months and months, the far-right blogosphere and pundits claimed that the liberal media was bringing up Sarah Palin's family for no reason. Bloggers and talking-heads said it was out of line and unimportant for the media to 'attack' a politician's children. Well, what about here? Anybody on the right ready to talk? So far, nobody's come forward (Michelle? Ann? Hannity?).

More interestingly though, is it's noteworthy that not a single politician's son has been brought up over the course of the past year, except for praise. Beau Biden was a decorated soldier and attorney. Track Palin fought bravely in Iraq. But Bristol Palin was the promiscuous one who got knocked up as a teenager. And now, Ashley Biden is the cokehead, even though there seems to be very little believable evidence that proves it.

While this may sound like a conspiracy theory, is it a systematic pattern here? If not, at least an inherent double standard?