Poll: Biden leads, Sanders second as top tier slips

Former Vice President Joe BidenJoe BidenTexas announces election audit in four counties after Trump demand Pennsylvania AG sues to block GOP subpoenas in election probe House passes sweeping defense policy bill MORE leads the Democratic field in a new national poll, followed by Sen. Bernie SandersBernie SandersOvernight Energy & Environment — Presented by the League of Conservation Voters — EPA finalizing rule cutting HFCs Manchin fires warning shot on plan to expand Medicare Democrats steamroll toward showdown on House floor 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 Warren11 senators urge House to pass .5T package before infrastructure bill Senate Democrats seeking information from SPACs, questioning 'misaligned incentives' UN secretary-general blasts space tourism MORE (D-Mass.), with 9 percent support, South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegDOJ sues to block JetBlue-American Airlines partnership On The Money — Presented by Wells Fargo — Pelosi plows full speed ahead on jam-packed agenda Blumenthal calls on Buttigieg to investigate American Airlines-JetBlue partnership MORE (D), with 6 percent, and former New York City Mayor Michael BloombergMichael BloombergDemocrats face bleak outlook in Florida Without drastic changes, Democrats are on track to lose big in 2022 Bidens, former presidents mark 9/11 anniversary 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.