Polls show Biden, Sanders and Warren at top of 2020 Democratic field - CBS News
KING 5 News poll: Biden edges Sanders days before Washington presidential primary | king5.com
Texas primary: Bernie Sanders, Joe Biden tied, poll says | kvue.com
CBS/YouGov Poll: Debate watchers believe Bernie Sanders made the best case for defeating Trump | YouGov
Yahoo News/YouGov: Biden leads Sanders ahead of Michigan primary | YouGov
Warren, Biden in virtual dead heat in Saint Anselm College poll of NH primary voters
New Polling Backs Up Leaked Trump Internals Showing Him Behind Joe Biden | Hardball | MSNBC - YouTube
CNN Poll of Polls: Biden and Sanders lead national Democratic primary | CNN Politics
Biden Boasts 16-Point Lead Over Sanders in Democratic Presidential Race - Morning Consult
Sanders, Biden are neck-and-neck in new NBC/WSJ national poll
Biden leads Sanders by 16 points in post-Super Tuesday poll
Kamala Harris had a very good first month of the 2020 Democratic primary campaign | CNN Politics
One Year From Election, Trump Trails Biden but Leads Warren in Battlegrounds - The New York Times
Chart: Bernie Sanders Takes the Lead | Statista
Compare Bernie Sanders and Joe Biden on the issues
Poll: Biden's lead narrows ahead of South Carolina primary - YouTube
How Joe Biden became the presumptive Democratic nominee — polling analysis - CBS News
One Year From Election, Trump Trails Biden but Leads Warren in Battlegrounds - The New York Times
Bernie Sanders ahead of Joe Biden in Texas, new poll shows | FOX 5 San Diego
Compare Bernie Sanders and Joe Biden on the issues
New poll shows Sen. Bernie Sanders with double-digit lead in California | FOX 5 San Diego
Biden Tops Electability Ratings | Monmouth University Polling Institute | Monmouth University
What Super Tuesday data tells us about who voted and why | PBS NewsHour
New poll shows Bernie Sanders in the lead in California | KRON4
Bernie Sanders Pulls Away From Pack in California | KQED
