KQED Poll: Harris Slips in California, as Warren, Sanders and Biden Lead the Pack | KQED
Trump Competitive Against Candidates Not Named Biden, Sanders
Fox News poll shows top Democratic candidates beating Trump
Election 2020: Bernie Sanders leads Joe Biden in Emerson poll
South Carolina primary: Joe Biden leads Bernie Sanders in NBC-Marist poll
Biden, Warren and Sanders top 3 national polls - POLITICO
Biden, Warren, Sanders stay on top; health is now an issue for Sanders: POLL - ABC News
Bernie Sanders is now tied with Joe Biden Reuters poll
Bernie Sanders surges to top in latest poll, takes lead over Biden as Warren slips
Democratic debate: Biden, Warren and Sanders spar over healthcare - BBC News
UH Poll: Biden, Sanders Virtually Tied In Texas – Houston Public Media
New CNN poll suggests a Bernie-Biden race for the Democratic nomination
Biden, Sanders statistically tied in Iowa, polling shows
New poll shows Joe Biden ahead of Bernie Sanders in Missouri presidential primary | FOX40
Bernie Sanders, Joe Biden, Elizabeth Warren lead new California poll
Sanders, Biden are neck-and-neck in new NBC/WSJ national poll
Poll: Biden and Sanders both lead Trump by 10 points nationally | TheHill
Biden Way Ahead in Sunshine State | FAU Business
Poll Position:' Biden leads Bernie in national poll | News, Sports, Jobs - The Nashua Telegraph
One Year From Election, Trump Trails Biden but Leads Warren in Battlegrounds - The New York Times
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Bernie Sanders leads Joe Biden in national ranked-choice poll — but it's close - Vox
WMUR/CNN poll: Sanders holds big lead over Clinton; Biden key factor
Bernie Sanders Pulls Away From Pack in California | KQED
Biden holds double-digit lead over Sanders nationally: poll | The Hill
