Michelle Obama would be tied with Biden as frontrunner if she ran in 2020, poll shows

Former first lady Michelle ObamaMichelle LeVaughn Robinson ObamaObama issues statement praising Paul Volcker Michelle Obama: Do I think US can come back from Trump impeachment? 'Oh yeah' Obamas buy home on Martha's Vineyard MORE tied with former Vice President Joe BidenJoe BidenThe media have fallen out of love with Bernie, but have voters? Top Zelensky aide refutes Sondland testimony The great AI debate: What candidates are (finally) saying about artificial intelligence MORE as the top choice among Democratic voters when asked who should be the party's nominee in 2020.

A Hill-HarrisX poll released Tuesday found that 25 percent of Democrats said they would back Obama in the party primary over nine other declared or potential candidates, including Sens. Bernie SandersBernie SandersSanders urges impeachment trial 'quickly' in the Senate The media have fallen out of love with Bernie, but have voters? Steyer rolls out 5B plan to invest in historically black colleges MORE (I-Vt.), Kamala HarrisKamala Devi HarrisThe media have fallen out of love with Bernie, but have voters? Krystal Ball: Media turns on Buttigieg, will this end him? Senate Democrats demand Trump fire Stephen Miller MORE (D-Calif.), Elizabeth WarrenElizabeth Ann WarrenThe media have fallen out of love with Bernie, but have voters? Buttigieg surrogate on candidate's past consulting work: 'I don't think it matters' Steyer rolls out 5B plan to invest in historically black colleges MORE (D-Mass.), and former Rep. Beto O’Rourke (D-Texas).

Obama has said she is not running, and Biden has not announced whether he will launch another White House bid.

Harris came in third among Democratic voters, with 12 percent saying they would support her. Sanders was a close fourth, at 11 percent. O’Rourke, former New York City Mayor Michael Bloomberg, Warren, and Sens. Cory BookerCory Anthony BookerSanders urges impeachment trial 'quickly' in the Senate Steyer rolls out 5B plan to invest in historically black colleges The great AI debate: What candidates are (finally) saying about artificial intelligence MORE (D-N.J.), Amy KlobucharAmy Jean KlobucharPoll: Biden leads Democratic field, Warren drops to third place 'Minor league cities' need new federal partnership The Hill's Morning Report - Sponsored by AdvaMed - Democrats to release articles of impeachment today MORE (D-Minn.) and Sherrod BrownSherrod Campbell BrownOn The Money: White House, Dems edge closer to trade deal | GOP worries about Trump concessions | DOJ argues Congress can't sue Trump on emoluments | Former Fed chief Volcker dies Both sides have reason to want speedy Trump impeachment trial Lawmakers battle over future of Ex-Im Bank MORE (D-Ohio) all failed to exceed 6 percent.

Biden and Obama garnered 23 percent and 22 percent, respectively, when factoring in independent voters, who are allowed to vote in many state primary elections.

When combining Democratic and independent voters, Sanders received 12 percent, followed by 8 percent for Harris.

Molly Murphy, a partner at Democratic consulting firm ALG Research, said Obama's popularity is helped in large part because she has never thrown her hat into the ring.

"Because she's never been a candidate, she's never been on the ballot, she's avoided a certain degree of scrutiny that candidates face. And so she's all icing for people, it's all good," Murphy said Tuesday on "What America's Thinking," Hill.TV's show about public opinion and polling.

In the Hill-HarrisX poll, 12 percent of independents and Democrats combined said they preferred another candidate, beyond the choices that were offered, suggesting some dissatisfaction among non-Republican voters with the field of declared and potential candidates.

A November Hill-HarrisX poll found that 14 percent of Democratic respondents picked "none of the above" when asked to choose between Warren, Biden, Sanders, Booker, Harris, Bloomberg and former Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonDOJ backs ex-Trump campaign aide Rick Gates's probation request The media have fallen out of love with Bernie, but have voters? Trump request for Ukrainian 'favor' tops notable quote list MORE.

Obama's surprise appearance at the Grammy awards this month promoted some speculation about a possible 2020 bid. In December, the former first lady said that she had "never" considered a political career and that she had no intention of running for office.

The Hill-HarrisX survey was conducted Feb. 17-18 among a nationally representative sample of registered voters. The overall survey has a sampling margin of error of 3 percentage points.

The group of Democratic respondents has a sampling margin of error of 5 percentage points, and the Democratic and independent set has a sampling margin of error of 4 percentage points.

—Matthew Sheffield