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.) has surged back into a single-digit deficit behind former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE in a poll of the Democratic primary field.

Sanders trails Biden by 9 percentage points in a Reuters-Ipsos poll released Tuesday, just one week after trailing the former vice president by 21 points in the same poll.

The Vermont senator sits at 39 percent among registered Democratic voters in the poll, compared to 48 percent for Biden. Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii), the only other Democratic contender remaining in the race, sits at 2 percent in the poll.

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Sanders is hoping for a resurgence in the primary after a damaging series of losses to Biden in South Carolina, in 10 states voting on Super Tuesday and then in Michigan last week. He now trails Biden by about 150 pledged delegates.

Three states are holding contests on Tuesday, with Biden favored in all three. But the coronavirus crisis gripping the country has added some uncertainty to the contests ahead. Ohio was also scheduled to hold a primary on Tuesday, but it was postponed due to worries about the coronavirus.

Biden remains the front-runner for the nomination after nearly being counted out of the race entirely following his own disappointing finishes in Iowa and New Hampshire behind candidates who have since dropped out and endorsed his candidacy, such as 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 (D).

The Reuters-Ipsos poll was taken between March 13 and March 16. Four hundred fifty-eight registered Democratic voters were surveyed with a margin of error of 5.2 percentage points.