by 3, Paul by 3, and a gaggle of lesser knowns ( Cruz, Christie, Kasich, and Fiorina ) by 2. Ten days ago nobody knew who Carly Fiorina was now she is within 2 points of the inevitable Hillary!
Perusing the internals of the poll invites the conclusion that Iowa voters don't like anybody very much. Barack Obama has a 43% approval rating which beats Republican Governor Terry Branstad's 42%. Seventy percent them have never heard of Lincoln Chafee but 24% don't like him compared to 6% who do. Saint Martin O'Malley has a 14% favorable and a 25% unfavorable rating which is pretty bad when 61% never heard of him. Naturally Hillary and the Donald are underwater big time as are Chris Christie and Rand Paul but Ben Carson is well respected with a 41% /23% favorability rating.