Former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE and Sen. Berne Sanders (I-Vt.) are the top two contenders for president in 2020 among Democratic voters, according to a new Morning Consult–Politico poll released Tuesday.

About 26 percent of Democrats want Biden to be the Democratic nominee in two years, while 19 percent want Sanders.

No other potential nominee polled in the double digits, though 21 percent of Democrats polled said they either didn’t know or had no opinion.

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Rep. Beto O’Rourke (D-Texas), who excited the Democratic base but lost his Senate bid to Sen. Ted Cruz Rafael (Ted) Edward CruzCruz blocks amended resolution honoring Ginsburg over language about her dying wish Trump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP MORE (R) last week by only 2.5 points, came in third in the list of preferences at 8 percent.

Those surveyed could choose from 20 options, ranging from Biden to Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (N.J.) to former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE to lawyer Michael Avenatti.

Biden has run for president twice, first in 1988 and then in 2008.

Sanders challenged eventual nominee Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE in the Democratic primary in 2016, mounting an insurgent campaign that was able to pick off several states’ primary and caucus contests and ignite a fervor among the progressive wing of the party.

While black Democrats favored Biden over Sanders by a 13-point margin, Sanders beat the former Vice President among the nation’s youngest voters by 8 points, the Morning Consult/Politico poll showed.

The Morning Consult/Politico poll surveyed 733 Democratic voters from Nov. 7 to 9 and has a margin of error of 4 percentage points.