Former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE has opened a 20-point lead over his rival for the Democratic presidential nomination, Sen. 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 (I-Vt.), in Arizona, according to a poll released a day before the state’s primary.

Biden is backed by 51 percent of likely Democratic primary voters surveyed in the Monmouth University poll released Monday.

Sanders's support is at 31 percent.

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Sanders leads Biden among Latino voters, 48 to 41 percent, based on the poll. The senator also has a lead with voters under 50 years old, at 56 to 28 percent.

But Sanders’s support is offset by Biden’s advantage with larger voting blocs in the state, including white voters at 55 percent to Sanders's 26 percent and voters 50 and over, at 64 percent to the senator's 16 percent.

Biden also beat President 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, 46 to 43 percent, but Sanders trailed Trump by 1 point, 43 percent to Trump’s 44 percent, according to the poll.

Trump narrowly won the state in 2016 by 4 points.

Biden and Sanders will face off in primaries in Arizona, Ohio, Florida and Illinois on Tuesday. Biden currently has a lead of 154 pledged delegate over Sanders.

The new poll also found Democratic Senate candidate Mark Kelly leading Sen. Martha McSally Martha Elizabeth McSallySenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R) by 6 points. Kelly is at 50 percent support and McSally has 44 percent.

The seat is one of the most vulnerable in the GOP-held Senate. The Cook Political report ranks the race a toss-up.

The poll was conducted from March 11 to 14 and surveyed 847 Arizona voters. Results based on the full voter sample have a margin of error of 3.4 percentage points. Results based on the sub-sample of 373 likely Democratic primary voters have a margin of error of 5.1 percentage points.