Democratic presidential front-runner 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 a big lead over rival 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 in Pennsylvania just days before the state's April 26 primary, according to a new Wall Street Journal/Marist/NBC poll.

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Among likely Democratic voters, Clinton has 55 percent support to Sanders's 40 percent.

She has over 60 percent support among African-Americans, voters over 45, women and voters who identify as Democrats.

But the Vermont senator continues to dominate among younger voters, with 60 percent of those under 45 supporting him.

Both candidates beat Republican 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 in a hypothetical general election match-up. Clinton leads the business mogul 54 to 39 percent, while Sanders tops him 57 to 37 percent.

The poll surveyed 734 likely Democratic primary voters from April 18 to 20. It has a margin of error of 3.6 percentage points.

Clinton's lead over Sanders is just 8 points, however, in a CBS News Battleground Tracker poll released early Sunday.