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Poll: Sanders, Biden seen as most popular second choices in Dem primary

Former Vice President Joe BidenJoe BidenGiuliani goes off on Fox Business host after she compares him to Christopher Steele Trump looks to shore up support in Nebraska Jeff Daniels narrates new Biden campaign ad for Michigan MORE and Sen. Bernie SandersBernie SandersIntercept bureau chief says congressional progressives looking to become stronger force in 2021 Obama book excerpt: 'Hard to deny my overconfidence' during early health care discussions Americans have a choice: Socialized medicine or health care freedom MORE (I-Vt.) are the most popular potential Democratic presidential candidates, but they are also the top second choices among registered voters, according to a Morning Consult survey released this week.

The poll found that Sanders was the second choice for 27 percent of Biden's supporters. Another 15 percent of Biden supporters said they would back Sen. Kamala HarrisKamala HarrisBiden pushes into Trump territory The Hill's Campaign Report: One week from Election Day | Biden looks to expand map | Trump trails narrowly in Florida, Arizona The Hill's 12:30 Report - Presented by Facebook - One week out, where the Trump, Biden race stands MORE (D-Calif.) while 9 percent said they supported Sen. Elizabeth WarrenElizabeth WarrenOvernight Defense: Dems want hearing on DOD role on coronavirus vaccine | US and India sign data-sharing pact | American citizen kidnapped in Niger Conservative operatives Wohl, Burkman charged in Ohio over false robocalls Senate Democrats want hearing on Pentagon vaccine effort MORE (D-Mass.).

Among Sanders's supporters, 26 percent said they supported Biden as a second choice, followed by Warren at 16 percent and Harris at 7 percent.

Warren and Sanders both hail from the progressive wing of the Democratic Party, while the poll showed some crossover between those supporting Biden and Harris.

Among Harris's supporters, 20 percent said they would choose Biden as a second choice, while Sanders was not among the top picks as a backup option. And among Biden supporters, 15 percent said they would support Harris as a second choice.

However, Sanders registered strongly as a second choice for Warren's supporters, with 25 percent saying the Vermont senator and 2016 runner-up for the Democratic nomination was a backup for them, followed by Harris at 14 percent and Biden at 13 percent.

Among former Rep. Beto O'RourkeBeto O'RourkeCalls grow for Democrats to ramp up spending in Texas Texas Dems highlight health care in fight to flip state House Union leader vows 'infrequent' minority voters will help deliver Biden victory MORE's (D-Texas) supporters, 20 percent said they would pick Sanders as a second option, while 18 percent chose Biden. 

O'Rourke has yet to announce whether he will run for president next year, though has been mulling a bid.

The poll comes as speculation around potential 2020 runs from Biden and Sanders heats up. 

The Hill reported on Thursday that sources familiar with the former vice president's plans say that he is almost certain to enter the 2020 fray.  

Yahoo News reported late last month that Sanders would announce his second presidential bid in the near future.

Warren formally launched her White House bid last weekend, while Harris entered the race late last month.

The Morning Consult poll was conducted from Feb. 4-10 among 11,627 registered voters. The survey's margin of error is plus or minus 1 percent. 

— Julia Manchester