Poll: Clinton leads in Florida, Illinois and Ohio
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Democratic presidential candidate Hillary ClintonHillary Rodham ClintonMichael Moore touts Ellison for DNC chair: ‘We need fresh blood’ Conquering Trump returns to conservative summit How the candidates for DNC chair stack up ahead of Saturday's vote 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 SandersMichael Moore touts Ellison for DNC chair: ‘We need fresh blood’ Tommy Chong: Trump pot crackdown 'will be defeated in court' DNC chair campaigns scramble ahead of tight vote 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 TrumpA very big deal to solve a very big problem Law professors file misconduct complaint against Conway: report State Dept. memo — on dangers of leaks — leaks to media 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.