John Zogby is out with his last Iowa tracking poll, which shows a dramatic shift toward Barack Obama. John Edwards also has reason to be pleased. The link is here; I've replicated the numbers below the jump.
Obama now has a 7-point lead over Clinton. Yesterday, they were tied, and two days ago, Clinton led him by 4 points. This election appears to be breaking toward Obama and Edwards and away from Clinton.
Also, Mike Huckabee has experienced a mini-surge on the Republican side and has expanded his lead over Mitt Romney to 31-25; it was 28-26 yesterday. Also a micro-surge for Ron Paul (10%), who is just one point behind Fred Thompson for 3rd place.