Poll: Biden leads, Sanders second as top tier slips

Former Vice President Joe BidenJoe BidenSunday shows preview: US reaffirms support for Ukraine amid threat of Russian invasion The Fed has a clear mandate to mitigate climate risks Biden says Roe v. Wade under attack like 'never before' MORE leads the Democratic field in a new national poll, followed by Sen. Bernie SandersBernie SandersSunday shows preview: US reaffirms support for Ukraine amid threat of Russian invasion Filibuster becomes new litmus test for Democrats Gallego says he's been approached about challenging Sinema MORE (I-Vt.), but all of the top-tier candidates had a slide in support. 

Biden was supported by 19 percent of Democrats and Democratic-leaning independents, while Sanders was supported by 14 percent in the Reuters–Ipsos survey published Thursday. 

They were trailed by Sen. Elizabeth WarrenElizabeth WarrenArizona Democratic Party executive board censures Sinema Democrats call on Biden administration to ease entry to US for at-risk Afghans Biden stiff arms progressives on the Postal Service MORE (D-Mass.), with 9 percent support, South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegThe Hill's Morning Report - Presented by Facebook - Biden talks, Senate balks Airlines suspend US flights in response to 5G deployment AT&T, Verizon to delay 5G rollout near certain airports MORE (D), with 6 percent, and former New York City Mayor Michael BloombergMichael BloombergBiden's Jan. 6 speech was a missed opportunity to unite the nation Democrats must face the reality of their Latino voter problem Invest in kids and families now so that someday I'll be out of a job MORE, who made his debut in the poll with 4 percent. 

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The top four all saw a dip in support since the last Reuters–Ipsos poll. Biden's support slipped by 2 points, Sanders's support fell by 3 points, Warren's support declined by 2 points and support for Buttigieg fell by 1 point. 

Those numbers are also significantly lower than those in the RealClearPolitics national average of polls. In that average, Biden has 27.8 percent support, Sanders 15.6 percent, Warren 14.2 percent and Buttigieg comes in fourth at 11.4 percent.

Nearly one-third of those surveyed in the Reuters poll, 31 percent, said they still don't know which candidate to support, the highest indecision level since the same poll in April.

Researchers surveyed 719 adults this week who identify as Democrats, independents and politically unaffiliated. It has a credibility interval of plus or minus 4 percentage points. 

The Iowa caucuses, the first 2020 primary contest, will be held in less than two months on Feb. 3. 

More than a dozen people are vying for the Democratic presidential nomination.