IA - 2016 Presidential Election: Hillary Clinton 45% - Scott Walker 44% - (Gravis Marketing 06/04/2015) chart & more info

Scott Walker
Hillary Clinton
  • Clinton +1

IA - 2016 Presidential Election: Mike Huckabee 45% - Hillary Clinton 44% - (Gravis Marketing 06/04/2015) chart & more info

Hillary Clinton
Mike Huckabee
  • Huckabee +1

IA - 2016 Presidential Election: Hillary Clinton 41% - Chris Christie 37% - (Gravis Marketing 06/04/2015) chart & more info

Chris Christie
Hillary Clinton
  • Clinton +4

IA - 2016 Presidential Election: Rand Paul 44% - Hillary Clinton 43% - (Gravis Marketing 06/04/2015) chart & more info

Hillary Clinton
Rand Paul
  • Paul +1

IA - 2016 Presidential Election: Hillary Clinton 43% - Carly Fiorina 40% - (Gravis Marketing 06/04/2015) chart & more info

Carly Fiorina
Hillary Clinton
  • Clinton +3

IA - 2016 Presidential Election: Hillary Clinton 43% - Marco Rubio 43% - (Gravis Marketing 06/04/2015) chart & more info

Marco Rubio
Hillary Clinton
  • Rubio 0

IA - 2016 Presidential Election: Hillary Clinton 46% - Ted Cruz 40% - (Gravis Marketing 06/04/2015) chart & more info

Ted Cruz
Hillary Clinton
  • Clinton +6

IA - 2016 Presidential Election: Hillary Clinton 44% - Ben Carson 41% - (Gravis Marketing 06/04/2015) chart & more info

Ben Carson
Hillary Clinton
  • Clinton +3

IA - 2016 Democratic Presidential Primary: Hillary Clinton 59% - Bernie Sanders 15% - Lincoln Chafee 1% - (Gravis Marketing 06/04/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +44

IA - 2016 Democratic Presidential Primary: Hillary Clinton 57% - Bernie Sanders 16% - Joe Biden 8% - (Des Moines Register 06/01/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +41

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 Democratic Presidential Primary: Hillary Clinton 60% - Bernie Sanders 15% - Joe Biden 11% - (Quinnipiac 05/07/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +45

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 Presidential Election: Hillary Clinton 48% - Scott Walker 41% - (PPP 05/01/2015) chart & more info

Scott Walker
Hillary Clinton
  • Clinton +7

IA - 2016 Presidential Election: Hillary Clinton 45% - Jeb Bush 42% - (PPP 05/01/2015) chart & more info

Jeb Bush
Hillary Clinton
  • Clinton +3