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 slim lead over 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 their presidential race in Missouri based on a new poll published Friday, according to The Kansas City Star.

Clinton leads Trump 42 to 40 percent in the DFM Research of Minnesota poll conducted on behalf of the United Transportation Union. The lead is within the poll's 3.8 percent margin of error.

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But the poll could be a troubling sign for Republicans who have taken Missouri in seven of the last nine presidential elections. The two exceptions are when the state went for Bill Clinton William (Bill) Jefferson ClintonBarr says Ginsburg 'leaves a towering legacy' Trump reacts to Ginsburg's death: 'An amazing woman who led an amazing life' Jimmy Carter remembers Ruth Bader Ginsburg as 'a beacon of justice' MORE in 1992 and 1996.

Hillary Clinton edged out a victory in the Democratic primary March 15, taking 49.6 percent of the vote to 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's 49.4 percent. Trump also won narrowly, besting GOP rival Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE 40.9 to 40.7 percent.

The survey also finds incumbent Sen. Roy Blunt Roy Dean BluntCDC tells Congress it urgently needs billion for vaccine distribution On The Money: Trump undercuts GOP, calls for bigger COVID-19 relief package | Communities of color hit hardest financially by COVID-19 | Businesses, states pass on Trump payroll tax deferral Trump undercuts GOP, calls for bigger COVID-19 relief package MORE (R) leading Democratic Secretary of State Jason Kander (D) 49 to 35 percent. But adding to Republican worries, 40 percent of those surveyed had never heard of Blunt's Democratic challenger.

A separate poll from Remington Research for Missouri Scout had Blunt leading Kander 44 percent to 37 percent, according to the Star.

The pollsters did not share their sample size or if the respondents were registered voters.