IA - 2016 Democratic Presidential Primary: Hillary Clinton 48% - Bernie Sanders 39% - Martin O'Malley 4% - (Des Moines Register/Bloomberg 12/14/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +9

IA - 2016 GOP Presidential Primary: Donald Trump 28% - Ted Cruz 27% - Marco Rubio 14% - (Quinnipiac 12/14/2015) chart & more info

Ted Cruz
Donald Trump
  • Trump +1

IA - 2016 Democratic Presidential Primary: Hillary Clinton 50% - Bernie Sanders 36% - Martin O'Malley 5% - (FOX News 12/13/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +14

IA - 2016 GOP Presidential Primary: Ted Cruz 28% - Donald Trump 26% - Ben Carson 10% - (FOX News 12/13/2015) chart & more info

Donald Trump
Ted Cruz
  • Cruz +2

IA - 2016 GOP Presidential Primary: Ted Cruz 31% - Donald Trump 21% - Ben Carson 13% - (Des Moines Register/Bloomberg 12/12/2015) chart & more info

Donald Trump
Ted Cruz
  • Cruz +10

IA - 2016 Democratic Presidential Primary: Hillary Clinton 55% - Bernie Sanders 33% - Martin O'Malley 6% - (Monmouth Univ. 12/08/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +22

IA - 2016 Democratic Presidential Primary: Hillary Clinton 54% - Bernie Sanders 36% - Martin O'Malley 4% - (CNN/ORC 12/07/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +18

IA - 2016 GOP Presidential Primary: Donald Trump 33% - Ted Cruz 20% - Marco Rubio 11% - (CNN/ORC 12/07/2015) chart & more info

Ted Cruz
Donald Trump
  • Trump +13

IA - 2016 GOP Presidential Primary: Ted Cruz 24% - Donald Trump 19% - Marco Rubio 17% - (Monmouth Univ. 12/07/2015) chart & more info

Donald Trump
Ted Cruz
  • Cruz +5

IA - 2016 GOP Presidential Primary: Ben Carson 27% - Donald Trump 15% - Ted Cruz 9% - (Iowa State Univ./WHO-HD 11/30/2015) chart & more info

Donald Trump
Ben Carson
  • Carson +12

IA - 2016 Democratic Presidential Primary: Hillary Clinton 50% - Bernie Sanders 28% - Martin O'Malley 3% - (Iowa State Univ./WHO-HD 11/30/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +22

IA - 2016 Democratic Presidential Primary: Hillary Clinton 51% - Bernie Sanders 42% - Martin O'Malley 4% - (Quinnipiac 11/25/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +9

IA - 2016 GOP Presidential Primary: Donald Trump 25% - Ben Carson 18% - Ted Cruz 23% - (Quinnipiac 11/24/2015) chart & more info

Ben Carson
Donald Trump
  • Trump +7

IA - 2016 GOP Presidential Primary: Donald Trump 25% - Ben Carson 23% - Marco Rubio 13% - (CNN/ORC 11/06/2015) chart & more info

Ben Carson
Donald Trump
  • Trump +2

IA - 2016 Democratic Presidential Primary: Hillary Clinton 55% - Bernie Sanders 37% - Martin O'Malley 3% - (CNN/ORC 11/06/2015) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +18

...
9
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