Sanders, Warren, Biden lead the Democratic Primary in California - Change Research
CNN Poll of Polls: Biden and Sanders lead national Democratic primary | CNN Politics
How Joe Biden became the presumptive Democratic nominee — polling analysis - CBS News
CBS News poll: Bernie Sanders leading among Democrats in Nevada - YouTube
Trump Competitive Against Candidates Not Named Biden, Sanders
100 Days to Election Day: Can Biden maintain lead in polls?
New poll shows Bernie Sanders in the lead in California | KRON4
Joe Biden remains the Democratic favorite among likely voters
It's still Biden and Sanders jockeying for the heart and soul of the Democratic Party
Texas primary: Bernie Sanders, Joe Biden tied, poll says | kvue.com
Bernie Sanders ahead of Joe Biden in Texas, new poll shows | KXAN Austin
New CNN poll puts Biden in the lead; Sanders and Warren behind by 10+ points - YouTube
One Year From Election, Trump Trails Biden but Leads Warren in Battlegrounds - The New York Times
What the Polls Say About a Donald Trump vs. Bernie Sanders Election
5 Democratic contenders lead Trump in head-to-head matchups: POLL - ABC News
Poll: Biden leads Sanders by 22 points – The Hill
New poll shows Bernie Sanders is the front runner in Nevada
/cdn.vox-cdn.com/uploads/chorus_asset/file/19218192/Screen_Shot_2019_09_20_at_3.04.06_PM.png "Election 2020: Biden, Sanders, and Warren poll best against Trump - Vox")
Election 2020: Biden, Sanders, and Warren poll best against Trump - Vox
Polls show Biden, Sanders and Warren at top of 2020 Democratic field - CBS News
Biden Boasts 16-Point Lead Over Sanders in Democratic Presidential Race - Morning Consult
Joe Biden holds lead over President Trump in Pennsylvania, new poll shows - 6abc Philadelphia
How Biden, Warren and Sanders fare vs. Trump in 2020 election polls
Chart: Bernie Sanders Takes the Lead | Statista
