One Year From Election, Trump Trails Biden but Leads Warren in Battlegrounds - The New York Times
Biden leads Sanders by 16 points in post-Super Tuesday poll
Voters Increasingly Place Biden Closer to the Ideological Extreme
Bernie Sanders surges to join Biden atop Democratic presidential pack in new poll | CNN Politics
Bernie Sanders supporters not yet on board with voting for Joe Biden
Iowa Poll: Biden, Sanders top early look at possible 2020 caucus field
Bernie Sanders Is Out-Polling Joe Biden
Biden, Warren and Sanders top 3 national polls - POLITICO
Polls show Biden, Sanders and Warren at top of 2020 Democratic field - CBS News
New poll shows Joe Biden ahead of Bernie Sanders in Missouri presidential primary | FOX40
Bernie Sanders, Joe Biden, Elizabeth Warren lead new California poll
Biden Boasts 16-Point Lead Over Sanders in Democratic Presidential Race - Morning Consult
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
Bernie Sanders ahead of Joe Biden in Texas, new poll shows | KXAN Austin
Trump Competitive Against Candidates Not Named Biden, Sanders
5 Democratic contenders lead Trump in head-to-head matchups: POLL - ABC News
Biden And Sanders Amp Up Criticism As Polls Show Them Separating From Field - capradio.org
CNN Poll of Polls: Biden and Sanders lead national Democratic primary | CNN Politics
Joe Biden 2020: Election News, Polls for President, Fundraising, Campaign, Opponents, Results & More - POLITICO
One Year From Election, Trump Trails Biden but Leads Warren in Battlegrounds - The New York Times
Democrats see Biden and Sanders as very different ideologically | Pew Research Center
