US - 2016 Presidential Election: Donald Trump 44% - Joe Biden 42% - (SurveyUSA 09/05/2015) chart & more info

Joe Biden
Donald Trump
  • Trump +2

US - 2016 Presidential Election: Joe Biden 48% - Donald Trump 40% - (Quinnipiac 08/27/2015) chart & more info

Donald Trump
Joe Biden
  • Biden +8

US - 2016 Presidential Election: Joe Biden 44% - Marco Rubio 41% - (Quinnipiac 08/27/2015) chart & more info

Marco Rubio
Joe Biden
  • Biden +3

US - 2016 Presidential Election: Joe Biden 45% - Jeb Bush 39% - (Quinnipiac 08/27/2015) chart & more info

Jeb Bush
Joe Biden
  • Biden +6

PA - 2016 Democratic Presidential Primary: Hillary Clinton 53% - Joe Biden 15% - Bernie Sanders 10% - (Quinnipiac 06/18/2015) chart & more info

Joe Biden
Hillary Clinton
  • Clinton +38

OH - 2016 Democratic Presidential Primary: Hillary Clinton 60% - Joe Biden 13% - Bernie Sanders 10% - (Quinnipiac 06/18/2015) chart & more info

Joe Biden
Hillary Clinton
  • Clinton +47

FL - 2016 Democratic Presidential Primary: Hillary Clinton 64% - Joe Biden 9% - Jim Webb 0% - (Quinnipiac 06/18/2015) chart & more info

Joe Biden
Hillary Clinton
  • Clinton +55

SC - 2016 Democratic Presidential Primary: Hillary Clinton 56% - Joe Biden 15% - Bernie Sanders 10% - (Morning Consult 06/15/2015) chart & more info

Joe Biden
Hillary Clinton
  • Clinton +41

US - 2016 Democratic Presidential Primary: Hillary Clinton 60% - Joe Biden 14% - Bernie Sanders 10% - (CNN/ORC 06/02/2015) chart & more info

Joe Biden
Hillary Clinton
  • Clinton +46

US - 2016 Democratic Presidential Primary: Hillary Clinton 62% - Joe Biden 14% - Bernie Sanders 10% - (ABC News/Wash Post 06/02/2015) chart & more info

Joe Biden
Hillary Clinton
  • Clinton +48

VA - 2016 Democratic Presidential Primary: Hillary Clinton 80% - Joe Biden 5% - Bernie Sanders 2% - (Christopher Newport Univ. 04/27/2015) chart & more info

Joe Biden
Hillary Clinton
  • Clinton +75

US - 2016 Democratic Presidential Primary: Hillary Clinton 62% - Joe Biden 9% - Bernie Sanders 4% - (FOX News 04/24/2015) chart & more info

Joe Biden
Hillary Clinton
  • Clinton +53

US - 2016 Democratic Presidential Primary: Hillary Clinton 60% - Joe Biden 10% - Bernie Sanders 8% - (Quinnipiac 04/23/2015) chart & more info

Joe Biden
Hillary Clinton
  • Clinton +50

US - 2016 Democratic Presidential Primary: Hillary Clinton 69% - Joe Biden 11% - Bernie Sanders 5% - (CNN/ORC 04/20/2015) chart & more info

Joe Biden
Hillary Clinton
  • Clinton +58

NC - 2016 Democratic Presidential Primary: Hillary Clinton 53% - Joe Biden 13% - Elizabeth Warren 11% - (PPP 04/10/2015) chart & more info

Joe Biden
Hillary Clinton
  • Clinton +40