Biden, Sanders statistically tied in Iowa, polling shows
Among Democrats, Christians lean toward Biden, while 'nones' prefer Sanders | Pew Research Center
18-29-Year-Olds Likely Democratic Primary Voters Prefer Sanders, Biden to O'Rourke in Harvard IOP Youth Poll | The Institute of Politics at Harvard University
One Year From Election, Trump Trails Biden but Leads Warren in Battlegrounds - The New York Times
Biden Boasts 16-Point Lead Over Sanders in Democratic Presidential Race - Morning Consult
Chart: Biden Feeling the Bern | Statista
US election 2020: Five charts on the Democratic race to take on Trump - BBC News
Iowa and New Hampshire poll: Bernie Sanders starts 2020 in strong position in 2 early states — CBS News Battleground Tracker poll - CBS News
Sanders banked on young voters. Here's how the numbers have played out | PBS NewsHour
Fox News poll shows top Democratic candidates beating Trump
One Year From Election, Trump Trails Biden but Leads Warren in Battlegrounds - The New York Times
Poll Position:' Biden leads Bernie in national poll | News, Sports, Jobs - The Nashua Telegraph
Saint Anselm poll: Buttigieg surges to 10 percentage point lead over Biden, Warren in NH
Chart: Bernie Sanders Takes the Lead | Statista
Why Bernie Sanders Is Electable, Too
5 Democratic contenders lead Trump in head-to-head matchups: POLL - ABC News
Poll: Biden leads Sanders by 22 points | TheHill
USC Dornsife/LA Times poll: Biden is the favorite among likely voters at nearly 2:1 - Press Room USC
CBS/YouGov Poll: Debate watchers believe Bernie Sanders made the best case for defeating Trump | YouGov
Election 2020: Latino voters back Biden, Sanders over President Trump
Why Bernie Sanders Is Electable, Too
Biden, Warren, Sanders stay on top; health is now an issue for Sanders: POLL - ABC News
Super Tuesday: Biden wins Texas, a blow to Sanders, NBC News projects
NBC/WSJ Poll: Trump vs. Biden, 2020 Democrats, Impeachment | Video | RealClearPolitics
How Biden, Warren and Sanders fare vs. Trump in 2020 election polls
Biden takes 32-point lead over Sanders in new 2020 poll | TheHill
CNN Poll of Polls: Biden and Sanders lead national Democratic primary - CNNPolitics
