Elizabeth Warren and Joe Biden drop in new 2020 poll - Los Angeles Times
Polls show Biden, Sanders and Warren at top of 2020 Democratic field - CBS News
Texas primary: Bernie Sanders, Joe Biden tied, poll says | kvue.com
2020 Poll: Biden, Sanders Lead Democratic Race To Take On Trump For President : NPR
2020 Democratic polls: Biden, Warren, Harris, Sanders on top in early contests, CBS News Battleground Tracker finds - CBS News
New poll shows Joe Biden ahead of Bernie Sanders in Missouri presidential primary | FOX 4 Kansas City WDAF-TV | News, Weather, Sports
NBC News poll: Biden holds narrow lead over Sanders in South Carolina
Biden, Sanders both top Trump in general election: poll | The Hill
Bernie Sanders, Joe Biden, Elizabeth Warren lead new California poll
Feb. 27, 2020 Press Release | Department of Political Science | UMass Amherst
Iowa Poll: Biden and Sanders Top List of Favored 2020 Democrats
Biden, Sanders other Democrats lead Trump in Michigan, poll finds
Lyceum poll: Bernie is Trump's toughest rival in Texas
Warren, Biden in virtual dead heat in Saint Anselm College poll of NH primary voters
How United Are Democrats? A 96-0 Data Point Offers a Hint - The New York Times
Bernie Sanders Pulls Away From Pack in California | KQED
KING 5 News poll: Biden edges Sanders days before Washington presidential primary | king5.com
Florida primary: Poll shows Biden leads Sanders, except with young
UT/TT Poll: Sanders and Biden Lead Texas Democratic Presidential Nomination Race; Trump Impeachment Trial Leaves Texans' Views Unwavering - UT News
Chart: Bernie Sanders Takes the Lead | Statista
Bernie Sanders is now tied with Joe Biden Reuters poll
/cdn.vox-cdn.com/uploads/chorus_asset/file/19753741/1208692873.jpg.jpg "Bernie Sanders leads Joe Biden in national ranked-choice poll — but it's close - Vox")
Bernie Sanders leads Joe Biden in national ranked-choice poll — but it's close - Vox
Poll: Joe Biden, Bernie Sanders Lead in Nevada
One Year From Election, Trump Trails Biden but Leads Warren in Battlegrounds - The New York Times
