Former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE leads the field of potential Democratic presidential contenders, according to a new poll.

Biden is supported by 26 percent of Democrats surveyed in a Morning Consult/Politico poll. He’s followed by Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.), who took 16 percent, and Sen. Kamala Harris Kamala HarrisThe Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins Kamala Harris: Black Americans have been 'disproportionately harmed' by Trump Biden town hall draws 3.3 million viewers for CNN MORE (D-Calif.) at 9 percent.

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While Biden hasn’t yet announced whether he will seek the Democratic nomination in 2020, he has consistently been viewed as a top-tier candidate in polls even as other high-profile Democrats, like Harris, have jumped into the contest.

Like Biden, Sanders has yet to say whether he will run, though both men are expected to announce their decisions in the coming weeks.

The Morning Consult/Politico poll showed Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) and former Rep. Beto O’Rourke (D-Texas) tied for fourth in the survey at 6 percent, while Sens. Kirsten Gillibrand Kirsten GillibrandSuburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits The Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida MORE (D-N.Y.) and Amy Klobuchar Amy KlobucharThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill EPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates MORE (D-Minn.) follow at 2 percent each among Democratic respondents.

Among Democratic women, Biden gains 2 points in his lead over Sanders – 28 percent to 14 percent. Democratic men also favored Biden over Sanders, albeit by a smaller margin – 23 percent to 19 percent.

The survey also showed a generational difference among Democratic voters. Boomers and Generation Xers picked Biden as their top choice, at 18 percent. But younger generations – Millennials and Generation Z – leaned more towards Sanders, at 19 percent and 20 percent, respectively.

The poll comes as the Democratic primary field is growing rapidly. Since Warren announced the formation of an exploratory committee on New Year’s Eve, a handful of other candidates have jumped into the race, including Gillibrand, Harris and Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii).

The Morning Consult/Politico poll surveyed 1,996 registered voters, including 694 Democrats, online from Jan. 18-22. It has a margin of error of plus or minus 2 percentage points.