IA - 2016 Democratic Presidential Primary: Hillary Clinton 55% - Bernie Sanders 26% - Martin O'Malley 4% - (NBC/Marist 07/26/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +29

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 Presidential Election: Scott Walker 45% - Hillary Clinton 37% - (Quinnipiac 07/22/2015) chart & more info

Hillary Clinton
Scott Walker
  • Walker +8

IA - 2016 Presidential Election: Jeb Bush 42% - Hillary Clinton 36% - (Quinnipiac 07/22/2015) chart & more info

Hillary Clinton
Jeb Bush
  • Bush +6

IA - 2016 Presidential Election: Marco Rubio 44% - Hillary Clinton 36% - (Quinnipiac 07/22/2015) chart & more info

Hillary Clinton
Marco Rubio
  • Rubio +8

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 Democratic Presidential Primary: Hillary Clinton 63% - Bernie Sanders 20% - Martin O'Malley 5% - (KBUR/We Ask America 07/09/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +43

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 Democratic Presidential Primary: Hillary Clinton 52% - Bernie Sanders 33% - Martin O'Malley 3% - (Quinnipiac 07/02/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +19

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 Democratic Presidential Primary: Hillary Clinton 50% - Bernie Sanders 24% - Martin O'Malley 2% - (Bloomberg 06/25/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +26

IA - 2016 Democratic Presidential Primary: Hillary Clinton 54% - Bernie Sanders 12% - Joe Biden 9% - (Morning Consult 06/15/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +42

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 Presidential Election: Hillary Clinton 43% - Jeb Bush 40% - (Gravis Marketing 06/04/2015) chart & more info

Jeb Bush
Hillary Clinton
  • Clinton +3

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