How Joe Biden became the presumptive Democratic nominee — polling analysis - CBS News
NH poll shows Biden, Sanders maintaining lead as Buttigieg makes surge
UH Poll: Biden, Sanders Virtually Tied In Texas – Houston Public Media
New poll shows Joe Biden ahead of Bernie Sanders in Missouri presidential primary | FOX40
Polls show Biden, Sanders and Warren at top of 2020 Democratic field - CBS News
Bernie Sanders ahead of Joe Biden in Texas, new poll shows | KXAN Austin
How Biden, Warren and Sanders fare vs. Trump in 2020 election polls
KING 5 News poll: Biden edges Sanders days before Washington presidential primary | king5.com
Emerson Polling - National Poll: Sanders Tied with Biden; O'Rourke Gets Post-Announcement Bump
Poll: Bernie, Warren surge to tie Biden atop Democratic field - POLITICO
How Joe Biden is Defusing Tensions With the Left | Time
/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
KQED Poll: Bernie Sanders Dominates the Field in California | KQED
2020 Poll: Biden, Sanders Lead Democratic Race To Take On Trump For President : NPR
South Carolina primary: Joe Biden leads Bernie Sanders in NBC-Marist poll
Bernie Sanders is now tied with Joe Biden Reuters poll
UMass poll gives Joe Biden, Bernie Sanders edge in 2020 New Hampshire Democratic primary - masslive.com
Trump Competitive Against Candidates Not Named Biden, Sanders
UMass Amherst/WCVB Poll: African American voters seeking candidate who can beat Trump
Bernie Sanders supporters not yet on board with voting for Joe Biden
Democrats see Biden and Sanders as very different ideologically | Pew Research Center
Chart: Bernie Sanders Takes the Lead | Statista
UT/TT Poll: Sanders and Biden Lead Texas Democratic Presidential Nomination Race; Trump Impeachment Trial Leaves Texans' Views Unwavering - UT News
Biden, Sanders Are Running Neck and Neck in Nationwide Poll - Bloomberg
Sanders, Biden are neck-and-neck in new NBC/WSJ national poll
New poll: Biden leads O'Rourke in Texas presidential primary, race against Sen. John Cornyn wide open
Biden, Warren, Sanders stay on top; health is now an issue for Sanders: POLL - ABC News
