Presidential hopeful Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) is in a dead heat nationally with former Vice President Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE, according to the latest NBC News-Wall Street Journal poll released Friday.

Of Democratic primary voters, 27 percent said they support the Vermont senator, while Biden gained 26 percent of the vote.

Sanders picked up 6 points from the same poll in December, when he garnered 21 percent.

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The numbers show that Sanders's support is rising nationally ahead of Monday's first-in-the-nation Iowa caucuses.

Sen. Elizabeth Warren Elizabeth WarrenGOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (D-Mass.) finished third with 15 percent of the vote and former New York Mayor Michael Bloomberg Michael BloombergTop Democratic super PAC launches Florida ad blitz after Bloomberg donation The Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida MORE, who has also seen his numbers steadily climb, finished fourth with 9 percent of the vote. Former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBipartisan praise pours in after Ginsburg's death Bogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq MORE rounded out the top five with 7 percent.

The RealClearPolitics average of national polls shows Biden holding onto a 5-point lead over Sanders, but Sanders has picked up more than 4 points in the average since the beginning of 2020.

The Iowa caucuses, which are Monday, are the first time that Americans get to voice their vote for who they want to see be the Democratic nominee in November. A recent Monmouth Iowa poll showed Biden with 2-point lead over Sanders and five candidates polling at 10 percent or higher.

The NBC-WSJ poll surveyed 428 Democratic primary voters and took place between Jan. 26-29 and has a margin of error of 4.7 percentage points.