‘None of the above’ tops list of potential 2020 Dems, poll shows

With the 2018 midterms in the rearview mirror, several Democrats are gearing up for the 2020 presidential contest. But so far, no Democrat has attracted broad support from the party's base, according to a new Hill.TV American Barometer poll.

The survey, conducted among 680 registered voters who identified themselves as Democrats or independents, found that "none of the above" was the most popular choice among potential 2020 challengers to President TrumpDonald John TrumpTrump calls Sri Lankan prime minister following church bombings Ex-Trump lawyer: Mueller knew Trump had to call investigation a 'witch hunt' for 'political reasons' The biggest challenge from the Mueller Report depends on the vigilance of everyone MORE.

Thirty percent of the sample said they would prefer that "none of the above" become the Democratic nominee when asked to choose among former Vice President Joe BidenJoseph (Joe) Robinette BidenWarren unveils plan to cancel student loan debt, create universal free college Moulton enters 2020 White House race The Hill's Morning Report - Is impeachment back on the table? MORE, Massachusetts Sen. Elizabeth WarrenElizabeth Ann WarrenTrump pushes back on impeachment talk: 'Tables are finally turning on the Witch Hunt!' Warren unveils plan to cancel student loan debt, create universal free college Moulton enters 2020 White House race MORE (D), Vermont Sen. Bernie SandersBernard (Bernie) SandersThe biggest challenge from the Mueller Report depends on the vigilance of everyone GOP Senate campaign arm hits battleground-state Dems over 'Medicare for All,' Green New Deal Warren unveils plan to cancel student loan debt, create universal free college MORE (I), New Jersey Sen. Cory BookerCory Anthony BookerWarren unveils plan to cancel student loan debt, create universal free college The Hill's Morning Report - Is impeachment back on the table? Booker: Barr's suggestion of spying on Trump campaign 'eroded' public's trust MORE (D), California Sen. Kamala HarrisKamala Devi HarrisWarren unveils plan to cancel student loan debt, create universal free college Moulton enters 2020 White House race The Hill's Morning Report - Is impeachment back on the table? MORE (D), former New York City Mayor Michael Bloomberg and former Secretary of State Hillary ClintonHillary Diane Rodham ClintonIt is wrong to say 'no collusion' 10 factors making Russia election interference the most enduring scandal of the Obama era And the winner of the Robert Mueller Sweepstakes is — Vladimir Putin MORE.

Twenty-five percent of respondents said Biden would be their preferred nominee. Sanders, who ran in the Democratic presidential primary in 2016, came in second with 18 percent.

Twelve percent of the independents and Democrats surveyed picked Clinton, Sanders's one-time presidential rival, who signaled a willingness to run again, saying in an October interviewer that she would still "like to be president."

Other candidates attracted even less support. Harris, Bloomberg and Warren were each the top choice for just 4 percent of respondents.

Warren had been regarded by some progressive advocates as a strong candidate, but she may have lost some support after provoking controversy by releasing a DNA test to address persistent questions about her claims of Native American heritage. A Morning Consult/Politico poll from October found that just 34 percent of Democratic respondents believed Warren's actions were "appropriate."

The American Barometer survey was conducted on Nov. 5-6 among 680 registered voters by the HarrisX polling company. The sampling margin of error is 3.76 percentage points.

— Matthew Sheffield