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Poll: Biden leads, Sanders second as top tier slips

Former Vice President Joe BidenJoe BidenFacebook, Twitter CEOs to testify before Senate Judiciary Committee on Nov. 17 Sanders hits back at Trump's attack on 'socialized medicine' Senate GOP to drop documentary series days before election hitting China, Democrats over coronavirus MORE leads the Democratic field in a new national poll, followed by Sen. Bernie SandersBernie SandersSanders hits back at Trump's attack on 'socialized medicine' Trump's debate performance was too little, too late Final debate: War Admiral vs. Seabiscuit 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 WarrenFinal debate: War Admiral vs. Seabiscuit Biden defends his health plan from Trump attacks Progressives blast Biden plan to form panel on Supreme Court reform MORE (D-Mass.), with 9 percent support, South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegLGBTQ voters must show up at the polls, or risk losing progress Buttigieg says it's time to 'turn the page' on Trump administration Sunday shows preview: Coronavirus cases surge in the Midwest; Trump hits campaign trail after COVID-19 MORE (D), with 6 percent, and former New York City Mayor Michael BloombergMichael BloombergThe Hill's Campaign Report: 2020 spending wars | Biden looks to clean up oil comments | Debate ratings are in Biden breaks all-time television spending record Trump squeezed by cash crunch in final election sprint 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.