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

Former first lady Michelle ObamaMichelle LeVaughn Robinson ObamaPoll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary Jill Biden takes starring role at difficult Olympics Obama to adapt memoir 'Dreams From My Father' for young readers MORE tied with former Vice President Joe BidenJoe BidenTrump hails Arizona Senate for audit at Phoenix rally, slams governor Republicans focus tax hike opposition on capital gains change Biden on hecklers: 'This is not a Trump rally. Let 'em holler' 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 SandersPoll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary Overnight Defense: US launches another airstrike in Somalia | Amendment to expand Pentagon recusal period added to NDAA | No. 2 State Dept. official to lead nuclear talks with Russia US launches second Somalia strike in week MORE (I-Vt.), Kamala HarrisKamala HarrisKavanaugh conspiracy? Demands to reopen investigation ignore both facts and the law 'CON laws' limit the health care competition Biden aims to deliver JD Vance takes aim at culture wars, childless politicians MORE (D-Calif.), Elizabeth WarrenElizabeth WarrenKavanaugh conspiracy? Demands to reopen investigation ignore both facts and the law Biden signals tough stance on tech with antitrust picks Poll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary 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 BookerKavanaugh conspiracy? Demands to reopen investigation ignore both facts and the law JD Vance takes aim at culture wars, childless politicians Poll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary MORE (D-N.J.), Amy KlobucharAmy KlobucharBiden signals tough stance on tech with antitrust picks Hillicon Valley: Democrats introduce bill to hold platforms accountable for misinformation during health crises | Website outages hit Olympics, Amazon and major banks Competition laws could be a death knell for startup mergers and acquisitions MORE (D-Minn.) and Sherrod BrownSherrod Campbell BrownSunday shows preview: Bipartisan infrastructure talks drag on; Democrats plow ahead with Jan. 6 probe White House on Cleveland Indians' name change: 'We certainly support their change of name' Key Biden ally OK with dropping transit from infrastructure package 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 ClintonBiden flexes presidential muscle on campaign trail with Virginia's McAuliffe Shontel Brown gaining ground against Nina Turner in Ohio: poll Biden hits trail for McAuliffe in test of his political brand 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