Poll: Clinton leads in Florida, Illinois and Ohio
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Democratic presidential candidate Hillary ClintonHillary Diane Rodham ClintonUSPS warns Pennsylvania mail-in ballots may not be delivered in time to be counted Senate leaves until September without coronavirus relief deal Gloria Steinem: Selection of Kamala Harris recognizes that 'black women ... are the heart and soul of the Democratic Party' 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 SandersBernie SandersChris Wallace: Trump struggling with attacks on 'shape-shifter' Harris Kamala Harris: The outreach Latinos need Biden and Harris seen as more moderate than Trump and Pence: poll MORE (I-Vt.) in Illinois, 51 to 45 percent.

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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 TrumpDonald John TrumpUSPS warns Pennsylvania mail-in ballots may not be delivered in time to be counted Michael Cohen book accuses Trump of corruption, fraud Trump requests mail-in ballot for Florida congressional primary 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.