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

Former Vice President Joe BidenJoe BidenPredictions of disaster for Democrats aren't guarantees of midterm failure A review of President Biden's first year on border policy  Vilsack accuses China of breaking commitments in Trump-era trade deal MORE and Sen. Bernie SandersBernie SandersDemocrats calls on Biden administration to ease entry to US for at-risk Afghans Briahna Joy Gray: Last-minute push for voting legislation felt 'perfomative' Biden stiff arms progressives on the Postal Service 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 HarrisTrump by the numbers: 2024 isn't simple Biden 'profoundly disappointed' after voting rights push fails in Senate Madame Tussauds unveils new Biden and Harris figures MORE (D-Calif.) while 9 percent said they supported Sen. Elizabeth WarrenElizabeth WarrenDemocrats calls on Biden administration to ease entry to US for at-risk Afghans Biden stiff arms progressives on the Postal Service Trump by the numbers: 2024 isn't simple 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'RourkeO'Rourke says he raised record .2M since launching campaign for Texas governor Eleven interesting races to watch in 2022 Cruz bullish on his 2024 chances: 'The runner-up is almost always the next nominee' 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