Zogby has been one of the most erratic of major national po0llsters.
Occasionally Zogby has been accurate, often far off the mark.
Zogby has had particular problems with Tennessee (I don't know why).
In 2004 he several times had Kerry in the lead in Tennessee (the only pollster to make that absurd assertion).
That was a bad sample in his Internet polls. I don't know if Zogby actually did phone polls in Tennessee in 2004.
Zogby's phone polls should be taken with a grain of salt, but they aren't the total horse crap that his Interactive polls are.