Yes, that Gary Hart. Regardless of your opinion of the man and the politician, the fact that a serious politician (and potential presidential candidate) validates the form in a way that few could.
Having said that, I'm sure that whatever makes it to the web will have been filtered through at least two levels of writers and/or consultants. And what content is already there is a bit on the guarded side. My friend Brian Lee suggests that we could call these blogs "e-blogs", for "edited blogs". I like that.