2020 Democratic polls: Biden, Warren, Harris, Sanders on top in early contests, CBS News Battleground Tracker finds - CBS News
Bernie Sanders surges to join Biden atop Democratic presidential pack in new poll | CNN Politics
Suffolk/Globe poll finds Sanders, Warren, Buttigieg, Biden in tight race in N.H. - The Boston Globe
NBC News poll: Biden holds narrow lead over Sanders in South Carolina
Feb. 27, 2020 Press Release | Department of Political Science | UMass Amherst
Florida primary: Poll shows Biden leads Sanders, except with young
Biden, Warren and Sanders top 3 national polls - POLITICO
Lyceum poll: Bernie is Trump's toughest rival in Texas
Bernie Sanders is now tied with Joe Biden Reuters poll
Elizabeth Warren and Joe Biden drop in new 2020 poll - Los Angeles Times
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Bernie Sanders leads Joe Biden in national ranked-choice poll — but it's close - Vox
New poll shows Joe Biden ahead of Bernie Sanders in Missouri presidential primary | FOX 4 Kansas City WDAF-TV | News, Weather, Sports
Bernie Sanders Pulls Away From Pack in California | KQED
Biden, Sanders Are Running Neck and Neck in Nationwide Poll - Bloomberg
Texas primary: Bernie Sanders, Joe Biden tied, poll says | kvue.com
KQED Poll: Harris Slips in California, as Warren, Sanders and Biden Lead the Pack | KQED
New poll shows Sen. Bernie Sanders with double-digit lead in California | FOX 5 San Diego
USC Dornsife/LA Times poll: Biden is the favorite among likely voters at nearly 2:1 - Press Room USC
National poll: Biden, Warren and Sanders locked together at top of primary - POLITICO
Polls show Biden, Sanders and Warren at top of 2020 Democratic field - CBS News
Biden, Warren, Sanders stay on top; health is now an issue for Sanders: POLL - ABC News
Poll: Joe Biden, Bernie Sanders in dead heat with Texas Democratic primary voters
Warren, Biden in virtual dead heat in Saint Anselm College poll of NH primary voters
Bernie Sanders ahead of Joe Biden in Texas, new poll shows | KXAN Austin
Iowa Poll: Biden and Sanders Top List of Favored 2020 Democrats
KING 5 News poll: Biden edges Sanders days before Washington presidential primary | king5.com
Sanders, Biden are neck-and-neck in new NBC/WSJ national poll
