Biden, Sanders other Democrats lead Trump in Michigan, poll finds
Bernie Sanders is now tied with Joe Biden Reuters poll
Biden, Warren, Sanders stay on top; health is now an issue for Sanders: POLL - ABC News
Sanders, Biden are neck-and-neck in new NBC/WSJ national poll
Democrats see Biden and Sanders as very different ideologically | Pew Research Center
Voters Increasingly Place Biden Closer to the Ideological Extreme
Where Biden and Sanders stand in the polls ahead of Tuesday's primaries | The Hill
Bernie Sanders supporters not yet on board with voting for Joe Biden
Biden, Warren and Sanders top 3 national polls - POLITICO
Saint Anselm poll: Buttigieg surges to 10 percentage point lead over Biden, Warren in NH
New poll shows Joe Biden ahead of Bernie Sanders in Missouri presidential primary | FOX40
Weighing Biden vs. Sanders? Compare where they stand on key issues | PBS NewsHour
5 Democratic contenders lead Trump in head-to-head matchups: POLL - ABC News
KQED Poll: Bernie Sanders Dominates the Field in California | KQED
Election Update: Two New Polls Show Biden's Upside Scenario | FiveThirtyEight
Polls show Biden, Sanders and Warren at top of 2020 Democratic field - CBS News
Joe Biden 2020: Election News, Polls for President, Fundraising, Campaign, Opponents, Results & More - POLITICO
Biden Way Ahead in Sunshine State | FAU Business
Bernie Sanders, Joe Biden, Elizabeth Warren lead new California poll
Sanders, Biden are neck-and-neck in new NBC/WSJ national poll
Suffolk/Globe poll finds Sanders, Warren, Buttigieg, Biden in tight race in N.H. - The Boston Globe
Chart: Bernie Sanders Takes the Lead | Statista
KQED Poll: Harris Slips in California, as Warren, Sanders and Biden Lead the Pack | KQED
Iowa Poll: Biden, Sanders top early look at possible 2020 caucus field
