I think maybe it's started early so we can get the dirt out and over with.
IMHO...it's starting this early so that the DBM can numb the minds of their viewers to the words "President Hillary Clinton"...they are floding the airwaves 20 months out with 24/7 election coverage to get their preferred "brabd association" into the people's heads so that on election day...they will blindly pull the lever.
It worked on the mid-terms and they've hoping it will work again in '08 as well.