Biden, Warren, Sanders stay on top; health is now an issue for Sanders: POLL - ABC News
Joe Biden holds the largest lead over President Donald Trump in battleground states | YouGov
Bernie Sanders supporters not yet on board with voting for Joe Biden
Compare Bernie Sanders and Joe Biden on the issues
Sanders, Biden are neck-and-neck in new NBC/WSJ national poll
Sanders Supporters Don't Love Joe Biden. How Much Will That Matter? - Morning Consult
Biden leads Sanders by 16 points in post-Super Tuesday poll
New poll shows Bernie Sanders in the lead in California | KRON4
2020 Democratic polls: Biden, Warren, Harris, Sanders on top in early contests, CBS News Battleground Tracker finds - CBS News
Why Bernie Sanders Is Electable, Too
CNN 2020 poll: Joe Biden has double-digit lead over Bernie Sanders - CNN Video
WMUR/CNN poll: Sanders holds big lead over Clinton; Biden key factor
Saint Anselm poll: Buttigieg surges to 10 percentage point lead over Biden, Warren in NH
Sanders Seizes Lead in Volatile Iowa Race, Times Poll Finds - The New York Times
KING 5 News poll: Biden edges Sanders days before Washington presidential primary | king5.com
On Super Tuesday “Gaps” - Edison Research
CBS/YouGov Poll: Debate watchers believe Bernie Sanders made the best case for defeating Trump | YouGov
US election 2020: Five charts on the Democratic race to take on Trump - BBC News
Poll: Biden leads Sanders by 22 points – The Hill
Biden Way Ahead in Sunshine State | FAU Business
UMass poll gives Joe Biden, Bernie Sanders edge in 2020 New Hampshire Democratic primary - masslive.com
Biden Boasts 16-Point Lead Over Sanders in Democratic Presidential Race - Morning Consult
Warren Leads Tight Iowa Race as Biden Fades, Poll Finds - The New York Times
UMass Amherst/WCVB Poll: African American voters seeking candidate who can beat Trump
