Sanders, Biden are neck-and-neck in new NBC/WSJ national poll
CNN Poll of Polls: Biden and Sanders lead national Democratic primary | CNN Politics
Voters Increasingly Place Biden Closer to the Ideological Extreme
Bernie Sanders is now tied with Joe Biden Reuters poll
Bernie Sanders, Joe Biden, Elizabeth Warren lead new California poll
Bernie Sanders supporters not yet on board with voting for Joe Biden
Lyceum poll: Bernie is Trump's toughest rival in Texas
Biden leads Sanders by 16 points in post-Super Tuesday poll
Trump Competitive Against Candidates Not Named Biden, Sanders
2020 Poll: Biden, Sanders Lead Democratic Race To Take On Trump For President : NPR
Joe Biden 2020: Election News, Polls for President, Fundraising, Campaign, Opponents, Results & More - POLITICO
Bernie Sanders surges to join Biden atop Democratic presidential pack in new poll | CNN Politics
New poll shows Joe Biden ahead of Bernie Sanders in Missouri presidential primary | FOX40
New poll shows Bernie Sanders is the front runner in Nevada
Iowa Poll: Biden, Sanders top early look at possible 2020 caucus field
Saint Anselm poll: Buttigieg surges to 10 percentage point lead over Biden, Warren in NH
Chart: Bernie Sanders Takes the Lead | Statista
Bernie Sanders ahead of Joe Biden in Texas, new poll shows | KXAN Austin
KQED Poll: Harris Slips in California, as Warren, Sanders and Biden Lead the Pack | KQED
Sanders, Biden are neck-and-neck in new NBC/WSJ national poll
Polls show Biden, Sanders and Warren at top of 2020 Democratic field - CBS News
