Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) tops the list of former Vice President Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE’s potential running mates, according to a Harvard CAPS/Harris Poll survey released exclusively to The Hill.

The poll shows that 1 in 5 registered voters — 20 percent — prefer Sanders for Biden’s vice presidential slot, the highest support of any would-be running mate presented to respondents in the survey.

But Sanders is unlikely to be considered, if not entirely ruled out, as Biden’s running mate in the general election. Biden vowed last month to choose a woman as his vice presidential pick and has said he’s considering a list of between six and 10 candidates for the job.

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That list remains secret, though there are a handful of potential candidates that have drawn speculation, including Sens. Kamala Harris Kamala HarrisSocial Security and Medicare are on the ballot this November Harris honors Ginsburg, visits Supreme Court The Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins MORE (D-Calif.) and Amy Klobuchar Amy KlobucharBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Klobuchar: GOP can't use 'raw political power right in middle of an election' MORE (D-Minn.), both former presidential candidates, as well as Michigan Gov. Gretchen Whitmer Gretchen WhitmerMichigan resident puts toilet on front lawn with sign 'Place mail in ballots here' Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Feehery: A surprising Republican wave election could be looming MORE (D) and Rep. Val Demings Valdez (Val) Venita DemingsFlorida Democrat introduces bill to recognize Puerto Rico statehood referendum Sunday shows - Trump team defends coronavirus response Demings slams GOP coronavirus relief bill: Americans 'deserve more than the crumbs from the table' MORE (D-Fla.).

The Harvard CAPS/Harris Poll survey, however, showed that the top-rated woman for the VP slot is Sen. Elizabeth Warren Elizabeth WarrenGOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (D-Mass.), one of Biden’s former rivals for the Democratic presidential nomination. Thirteen percent of registered voters surveyed said that Biden should choose the Massachusetts senator as his running mate.

Warren has expressed at least some interest in the job.

Asked by MSNBC’s Rachel Maddow Rachel Anne MaddowMichael Cohen: Trump hates Obama because he's everything he 'wants to be' The Hill's 12:30 Report - Presented by Facebook - Trump floats 0M+ in personal spending for reelection bid Feehery: Unconventionally debunking the latest political conventional wisdom MORE last week what her response would be if Biden were to offer her a spot on the ticket, Warren responded bluntly: “Yes.”

Harris and Klobuchar, meanwhile, both notched 10 percent in the survey, while Whitmer came in with 3 percent.

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Meanwhile, 7 percent of registered voters surveyed said they would prefer former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBipartisan praise pours in after Ginsburg's death Bogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq MORE; 8 percent preferred former New York City Mayor Michael Bloomberg Michael BloombergTop Democratic super PAC launches Florida ad blitz after Bloomberg donation The Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida MORE (D); 3 percent preferred billionaire activist Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE; and 11 percent said they would prefer New York Gov. Andrew Cuomo Andrew CuomoNYT editorial board remembers Ginsburg: She 'will forever have two legacies' New York to honor Ginsburg with statue in Brooklyn New York City bus driver knocked out by passenger he told to wear a mask MORE. Buttigieg, Bloomberg and Steyer are former 2020 candidates for the Democratic nomination.

Mark Penn Mark PennTrump, Biden battle over rush for COVID-19 vaccine The 7 keys to victory in the presidential race Biden leads Trump on law and order, coronavirus: poll MORE, the co-director of the Harvard CAPS/Harris Poll, said that Sanders’s top spot on the list likely owes to his appeal to the progressive wing of the Democratic Party. But he said that geographic considerations — Klobuchar’s status as a Midwestern senator, for instance — may be on voters’ minds, as well.

“I think looking at the list, a lot of the party would favor Bernie Sanders, who would energize the left wing of the party,” Penn said. “But I suspect, based on this polling, that Amy Klobuchar is at the top of the list given her Midwestern credentials, though Kamala Harris would also be in the running.”

Biden has signaled that his running mate search is set to begin in earnest in mid-April, telling donors in at a virtual fundraising event that he would soon announce the formation of a committee to vet potential vice presidential candidates.

“It’s kind of presumptuous, but sometime in the middle of the month we’re going to announce a committee that’s going to be overseeing the vice presidential selection process,” he said, according to a press pool report at the time.

Other possible picks that have received speculation include Sen. Catherine Cortez Masto Catherine Marie Cortez MastoDemocratic Senate campaign arm raised nearly M in August VA problems raise worries about mail slowdown, prescriptions Cortez Masto touts mail-in voting in convention speech MORE (D-Nev.) and Stacey Abrams, the 2018 Democratic nominee for Georgia governor, who has openly expressed interest in the running mate slot.

Biden and his associates have also spoken with former President Obama and 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 about the process of selecting a running mate. Holder co-chaired the process for Obama in 2008 along with Caroline Kennedy.

Harvard CAPS/Harris Poll surveyed 2,394 registered voters from April 14 to 16. The poll is a collaboration of the Center for American Political Studies at Harvard University and The Harris Poll. The Hill will be working with Harvard CAPS/Harris Poll throughout 2020.

Full poll results will be posted online later this week. The Harvard CAPS/Harris Poll survey is an online sample drawn from the Harris Panel and weighted to reflect known demographics. As a representative online sample, it does not report a probability confidence interval.