IA - 2016 GOP Presidential Primary: Donald Trump 22% - Ben Carson 14% - Scott Walker 9% - (CNN/ORC 08/12/2015) chart & more info

Ben Carson
Donald Trump
  • Trump +8

IA - 2016 GOP Presidential Primary: Donald Trump 17% - Scott Walker 12% - Marco Rubio 10% - (Suffolk Univ/USA Today 08/11/2015) chart & more info

Scott Walker
Donald Trump
  • Trump +5

IA - 2016 GOP Presidential Primary: Donald Trump 19% - Scott Walker 12% - Ben Carson 12% - (PPP 08/10/2015) chart & more info

Scott Walker
Donald Trump
  • Trump +7

IA - 2016 GOP Presidential Primary: Scott Walker 19% - Donald Trump 17% - Jeb Bush 12% - (NBC/Marist 07/26/2015) chart & more info

Donald Trump
Scott Walker
  • Walker +2

IA - 2016 GOP Presidential Primary: Scott Walker 22% - Donald Trump 13% - Jeb Bush 7% - (Monmouth Univ. 07/20/2015) chart & more info

Donald Trump
Scott Walker
  • Walker +9

IA - 2016 GOP Presidential Primary: Scott Walker 18% - Jeb Bush 12% - Rand Paul 10% - (KBUR/We Ask America 07/09/2015) chart & more info

Jeb Bush
Scott Walker
  • Walker +6

IA - 2016 GOP Presidential Primary: Scott Walker 18% - Donald Trump 10% - Rand Paul 9% - (Quinnipiac 07/01/2015) chart & more info

Donald Trump
Scott Walker
  • Walker +8

IA - 2016 GOP Presidential Primary: Scott Walker 18% - Mike Huckabee 10% - Rand Paul 10% - (Morning Consult 06/15/2015) chart & more info

Mike Huckabee
Scott Walker
  • Walker +8

IA - 2016 GOP Presidential Primary: Scott Walker 17% - Marco Rubio 13% - Rand Paul 4% - (Gravis Marketing 06/04/2015) chart & more info

Marco Rubio
Scott Walker
  • Walker +4

IA - 2016 GOP Presidential Primary: Scott Walker 17% - Marco Rubio 7% - Rand Paul 10% - (Des Moines Register 05/31/2015) chart & more info

Marco Rubio
Scott Walker
  • Walker +10

IA - 2016 GOP Presidential Primary: Scott Walker 21% - Marco Rubio 13% - Rand Paul 13% - (Quinnipiac 05/06/2015) chart & more info

Marco Rubio
Scott Walker
  • Walker +8

IA - 2016 GOP Presidential Primary: Scott Walker 23% - Jeb Bush 12% - Marco Rubio 13% - (PPP 04/28/2015) chart & more info

Jeb Bush
Scott Walker
  • Walker +11

IA - 2016 GOP Presidential Primary: Scott Walker 13% - Jeb Bush 10% - Marco Rubio 10% - (Loras College 04/28/2015) chart & more info

Jeb Bush
Scott Walker
  • Walker +3

IA - 2016 GOP Presidential Primary: Jeb Bush 16% - Scott Walker 13% - Rand Paul 9% - (Gravis Marketing 04/22/2015) chart & more info

Scott Walker
Jeb Bush
  • Bush +3

IA - 2016 GOP Presidential Primary: Scott Walker 25% - Rand Paul 13% - Mike Huckabee 11% - (Quinnipiac 02/25/2015) chart & more info

Rand Paul
Scott Walker
  • Walker +12