USC Dornsife/LA Times poll: Biden is the favorite among likely voters at nearly 2:1 - Press Room USC
One Year From Election, Trump Trails Biden but Leads Warren in Battlegrounds - The New York Times
Bernie Sanders Pulls Away From Pack in California | KQED
Chart: Bernie Sanders Takes the Lead | Statista
Biden, Sanders both top Trump in general election: poll | The Hill
Bernie Sanders is now tied with Joe Biden Reuters poll
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
Bernie Sanders, Joe Biden, Elizabeth Warren lead new California poll
UT/TT Poll: Sanders and Biden Lead Texas Democratic Presidential Nomination Race; Trump Impeachment Trial Leaves Texans' Views Unwavering - UT News
KING 5 News poll: Biden edges Sanders days before Washington presidential primary | king5.com
How Biden, Warren and Sanders fare vs. Trump in 2020 election polls
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Bernie Sanders leads Joe Biden in national ranked-choice poll — but it's close - Vox
Bernie Sanders ahead of Joe Biden in Texas, new poll shows | KXAN Austin
CNN Poll of Polls: Biden and Sanders lead national Democratic primary | CNN Politics
2020 Poll: Biden, Sanders Lead Democratic Race To Take On Trump For President : NPR
Feb. 27, 2020 Press Release | Department of Political Science | UMass Amherst
How United Are Democrats? A 96-0 Data Point Offers a Hint - The New York Times
Texas primary: Bernie Sanders, Joe Biden tied, poll says | kvue.com
Bernie Sanders surges to join Biden atop Democratic presidential pack in new poll | CNN Politics
Biden, Sanders Are Running Neck and Neck in Nationwide Poll - Bloomberg
NBC News poll: Biden holds narrow lead over Sanders in South Carolina
Polls show Biden, Sanders and Warren at top of 2020 Democratic field - CBS News
National poll: Biden, Warren and Sanders locked together at top of primary - POLITICO
Sanders, Biden are neck-and-neck in new NBC/WSJ national poll
New poll shows Sen. Bernie Sanders with double-digit lead in California | FOX 5 San Diego
