IA - 2016 Democratic Presidential Primary: Hillary Clinton 48% - Bernie Sanders 45% - Martin O'Malley 3% - (NBC/WSJ/Marist 01/28/2016) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +3

IA - 2016 GOP Presidential Primary: Donald Trump 32% - Ted Cruz 25% - Marco Rubio 18% - (NBC/WSJ/Marist 01/28/2016) chart & more info

Ted Cruz
Donald Trump
  • Trump +7

IA - 2016 GOP Presidential Primary: Donald Trump 30% - Ted Cruz 23% - Marco Rubio 16% - (Monmouth Univ. 01/27/2016) chart & more info

Ted Cruz
Donald Trump
  • Trump +7

IA - 2016 Democratic Presidential Primary: Bernie Sanders 49% - Hillary Clinton 45% - Martin O'Malley 4% - (Quinnipiac 01/27/2016) chart & more info

Hillary Clinton
Bernie Sanders
  • Sanders +4

IA - 2016 GOP Presidential Primary: Ted Cruz 26% - Donald Trump 19% - Marco Rubio 12% - (Iowa State Univ./WHO-HD 01/26/2016) chart & more info

Donald Trump
Ted Cruz
  • Cruz +7

IA - 2016 Democratic Presidential Primary: Hillary Clinton 47% - Bernie Sanders 45% - Martin O'Malley 1% - (Iowa State Univ./WHO-HD 01/26/2016) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +2

IA - 2016 GOP Presidential Primary: Donald Trump 31% - Ted Cruz 29% - Marco Rubio 13% - (Quinnipiac 01/26/2016) chart & more info

Ted Cruz
Donald Trump
  • Trump +2

IA - 2016 Democratic Presidential Primary: Hillary Clinton 48% - Bernie Sanders 42% - Martin O'Malley 3% - (FOX News 01/25/2016) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +6

IA - 2016 Democratic Presidential Primary: Bernie Sanders 48% - Hillary Clinton 45% - Martin O'Malley 3% - (ARG 01/25/2016) chart & more info

Hillary Clinton
Bernie Sanders
  • Sanders +3

IA - 2016 GOP Presidential Primary: Donald Trump 33% - Ted Cruz 26% - Marco Rubio 11% - (ARG 01/25/2016) chart & more info

Ted Cruz
Donald Trump
  • Trump +7

IA - 2016 GOP Presidential Primary: Donald Trump 34% - Ted Cruz 23% - Marco Rubio 12% - (FOX News 01/24/2016) chart & more info

Ted Cruz
Donald Trump
  • Trump +11

IA - 2016 GOP Presidential Primary: Donald Trump 33% - Ted Cruz 23% - Marco Rubio 14% - (Emerson College 01/22/2016) chart & more info

Ted Cruz
Donald Trump
  • Trump +10

IA - 2016 Democratic Presidential Primary: Hillary Clinton 52% - Bernie Sanders 43% - Martin O'Malley 3% - (Emerson College 01/22/2016) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +9

IA - 2016 Democratic Presidential Primary: Hillary Clinton 59% - Bernie Sanders 30% - Martin O'Malley 7% - (Loras College 01/22/2016) chart & more info

Bernie Sanders
Hillary Clinton
  • Clinton +29

IA - 2016 Democratic Presidential Primary: Bernie Sanders 51% - Hillary Clinton 43% - Martin O'Malley 4% - (CNN/ORC 01/21/2016) chart & more info

Hillary Clinton
Bernie Sanders
  • Sanders +8

...
6
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