Democratic presidential candidate Hillary ClintonHillary Rodham ClintonDem rep: Benghazi panel among my ‘saddest exercises’ The real lesson for the US elections From Brexit — watch the polls! The Hill's 12:30 Report 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 SandersDemocrats MIA on student loans Polls show tight Clinton-Trump race in 2016 battlegrounds Polls show tight Clinton-Trump race in 2016 battlegrounds MORE (I-Vt.) in Illinois, 51 to 45 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 TrumpMcCain: 'It's up to every delegate to make up their own minds' WATCH LIVE: Trump talks trade The real lesson for the US elections From Brexit — watch the polls! 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.