Biden and Warren participate at the sixth Democratic primary debate. Photo: Frederic J. Brown/AFP via Getty Images

Sen. Bernie Sanders has gained momentum to become the first choice among likely Iowa caucus-goers three weeks before the nation's first presidential contest, while Sen. Elizabeth Warren and former South Bend Mayor Pete Buttigieg have slowed in the latest poll from The Des Moines Register, Mediacom and CNN.

Why it matters: But taking the margin of error into account, the poll shows the Vermont senator in a statistical dead heat with Warren, Buttigieg and former Vice President Joe Biden.

By the numbers: Sanders is the top choice for president for 20% of likely attendees to the Democratic caucus, the poll shows. Warren stands in second place at 17% and Buttigieg takes third at 16%, while Joe Biden stands at 15%.

Methodology: The latest poll tallied 701 likely Democratic caucus-goers from Jan. 2-8. The poll's margin of error is -/+ 3.7 percentage points.

  • Due to the poll's margin of error, all four top candidates are in a statistical dead heat.

Be smart: Sanders clawed back 5 percentage points from the November poll, when Buttigieg was the first choice among 25 percent of likely caucus goers. Warren came in first among 16 percent of those polled, while Biden and Sanders were each the favorite of 15 percent at the time.

Yes, but: Sanders beat his competitors in Q4 fundraising, raking in $34.5 million — while Buttigieg followed at $24.7 million.

  • Sanders' "anti-establishment message hasn’t changed for 50 years, and it resonates with working-class voters and young people who agree the system is corrupt and it will take a revolution to fix it," the New York Times' Sydney Ember wrote in December.

Go deeper: Bernie Sanders is the dominant Democrat of the Trump era

Editor's note: This piece has been updated to show that Sanders has gained momentum in the January poll.

Go deeper

Biden: The next president should decide on Ginsburg’s replacement

Joe Biden. Photo: Drew Angerer / Getty Images

Joe Biden is calling for the winner of November's presidential election to select Ruth Bader Ginsburg's replacement on the Supreme Court.

What he's saying: "[L]et me be clear: The voters should pick the president and the president should pick the justice for the Senate to consider," Biden said. "This was the position the Republican Senate took in 2016 when there were almost 10 months to go before the election. That's the position the United States Senate must take today, and the election's only 46 days off.

Trump, McConnell to move fast to replace Ginsburg

Photo: Alex Wong/Getty Images

President Trump will move within days to nominate his third Supreme Court justice in just three-plus short years — and shape the court for literally decades to come, top Republican sources tell Axios.

Driving the news: Senate Majority Leader Mitch McConnell and Senate Republicans are ready to move to confirm Trump's nominee before Election Day, just 46 days away, setting up one of the most consequential periods of our lifetimes, the sources say.

Updated 3 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 10 p.m. ET: 30,393,591 — Total deaths: 950,344— Total recoveries: 20,679,272Map.
  2. U.S.: Total confirmed cases as of 10 p.m. ET: 6,722,699 — Total deaths: 198,484 — Total recoveries: 2,556,465 — Total tests: 92,163,649Map.
  3. Politics: In reversal, CDC again recommends coronavirus testing for asymptomatic people.
  4. Health: Massive USPS face mask operation called off The risks of moving too fast on a vaccine.
  5. Business: Unemployment drop-off reverses course 1 million mortgage-holders fall through safety netHow the pandemic has deepened Boeing's 737 MAX crunch.
  6. Education: At least 42% of school employees are vulnerable.