Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE holds leads in Florida, Illinois and Ohio, according to a NBC News/Wall Street Journal/Marist poll released Sunday.

Clinton holds a narrow lead over rival Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) in Illinois, 51 to 45 percent.

ADVERTISEMENT

In Florida, meanwhile, Clinton holds a much larger lead, 61 to 34 percent.

Clinton also holds a large lead in Ohio, taking 58 percent of the vote, compared to Sanders, who takes just 38 percent.

According to the poll, Clinton holds the lead among African-American Democratic voters in all three states. Among Hispanics, she has a slight lead over Sanders in Florida, 51 to 46 percent, but Sanders takes the lead among Hispanics in Illinois, 64 to 30 percent.

In a general election match-up in Florida and Ohio, Clinton and Sanders both lead Republican presidential front-runner Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE.

Pollsters surveyed likely Democratic primary voters between March 4 and 10.The results have a margin of error of 4.4 percent in Florida, a margin of error of 4.3 percent in Illinois and a margin of error of 4.6 percent in Ohio.

Clinton leads Sanders by 31 points in Florida, according to a RealClearPolitics average of polls that also shows her ahead of Sanders by almost 18 points in Ohio and almost 14 points in Illinois.

--This report was updated at 12:48 p.m.