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

Former first lady Michelle ObamaMichelle LeVaughn Robinson ObamaMichelle Obama on 'Becoming': 'Sasha still hasn't read it' Michelle Obama seeks volunteers for local campaigns: There are 'no "off" years' Obama condemns 'hatred in all its forms' after New Zealand shooting MORE tied with former Vice President Joe BidenJoseph (Joe) Robinette BidenPollster says 'it's certainly not looking good' for Trump ahead of 2020 Republican strategist predicts his 2020 Dem primary final four The Hill's 12:30 Report: Trump feuds heat up 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 SandersBernard (Bernie) SandersWarren, Klobuchar call on FTC to curtail use of non-compete clauses RNC says it raised .6 million in February Pollster says 'it's certainly not looking good' for Trump ahead of 2020 MORE (I-Vt.), Kamala HarrisKamala Devi HarrisJ.J. Abrams, Shonda Rhimes to host Kamala Harris fundraiser Warren, Klobuchar call on FTC to curtail use of non-compete clauses Pollster says 'it's certainly not looking good' for Trump ahead of 2020 MORE (D-Calif.), Elizabeth WarrenElizabeth Ann WarrenWarren, Klobuchar call on FTC to curtail use of non-compete clauses Pollster says 'it's certainly not looking good' for Trump ahead of 2020 Big Tech is not the enemy, Sen. Warren 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 BookerWarren, Klobuchar call on FTC to curtail use of non-compete clauses Citizens lose when partisans play politics with the federal judiciary Booker opens up about relationship with Rosario Dawson MORE (D-N.J.), Amy KlobucharAmy Jean KlobucharWarren, Klobuchar call on FTC to curtail use of non-compete clauses Republican strategist predicts his 2020 Dem primary final four Chicago mayor race mirrors national push for more women in office, says columnist MORE (D-Minn.) and Sherrod BrownSherrod Campbell BrownWarren, Klobuchar call on FTC to curtail use of non-compete clauses The Hill's Morning Report - Trump, Dems put manufacturing sector in 2020 spotlight Trump faces political risks in fight over GM plant 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 ClintonTrump mocks wind power: 'When the wind doesn't blow, just turn off the television' Trump's approval rating stable at 45 percent Kellyanne Conway: 'I think my gender helps me with the president' 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