Lyceum poll: Bernie is Trump's toughest rival in Texas
Biden, Sanders other Democrats lead Trump in Michigan, poll finds
Polls show Biden, Sanders and Warren at top of 2020 Democratic field - CBS News
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
Biden, Warren, Sanders stay on top; health is now an issue for Sanders: POLL - ABC News
Iowa Poll: Biden and Sanders Top List of Favored 2020 Democrats
Suffolk/Globe poll finds Sanders, Warren, Buttigieg, Biden in tight race in N.H. - The Boston Globe
UT/TT Poll: Sanders and Biden Lead Texas Democratic Presidential Nomination Race; Trump Impeachment Trial Leaves Texans' Views Unwavering - UT News
CNN Poll of Polls: Biden and Sanders lead national Democratic primary | CNN Politics
Bernie Sanders is now tied with Joe Biden Reuters poll
New poll shows Joe Biden ahead of Bernie Sanders in Missouri presidential primary | FOX 4 Kansas City WDAF-TV | News, Weather, Sports
Elizabeth Warren and Joe Biden drop in new 2020 poll - Los Angeles Times
How United Are Democrats? A 96-0 Data Point Offers a Hint - The New York Times
NBC News poll: Biden holds narrow lead over Sanders in South Carolina
Chart: Bernie Sanders Takes the Lead | Statista
Warren, Biden in virtual dead heat in Saint Anselm College poll of NH primary voters
Bernie Sanders Pulls Away From Pack in California | KQED
New poll shows Sen. Bernie Sanders with double-digit lead in California | FOX 5 San Diego
Poll: Joe Biden, Bernie Sanders in dead heat with Texas Democratic primary voters
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
Biden, Warren and Sanders top 3 national polls - POLITICO
