From blogging. Because it's the medium's fault, apparently, that his unsourced, irresponsible "reporting" was used to smear Sotomayor:
Isn't it amazing -- and extremely revealing -- that even as recently as five years ago, the Jeffrey Rosens and TNRs of the world could do things like this, and routinely did them, without any meaningful response or check of any kind? Is it really hard to see why so many establishment media figures harbor such disdain for "bloggers" and blame them for most of their woes? If you enjoyed a monopoly on controlling political discourse and were free to spout the most irresponsible claims without any consequence, wouldn't you also deeply resent whatever it was or whoever it was that put an end to that?
Here's a suggestion for TNR: don't print anonymous quotes. Otherwise you get people asking questions like, who the hell is Person X? And why should I care what Person X thinks?
-- Update --
NPR has a nice overview here.