At least according to the new PPP poll:

PPP’s new Iowa poll…continues to find Donald Trump leading in the state. He’s at 31% to 23% for Ted Cruz, 14% for Marco Rubio, 9% for Ben Carson, 4% each for Jeb Bush, Mike Huckabee, and Rand Paul, 3% for Carly Fiorina, 2% each for Chris Christie and John Kasich, and 1% each for Jim Gilmore and Rick Santorum.