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Poll: Biden leads, Sanders second as top tier slips

Former Vice President Joe BidenJoe BidenBiden to meet with 6 GOP senators next week Arizona secretary of state gets security detail over death threats surrounding election audit On The Money: Five takeaways on a surprisingly poor jobs report | GOP targets jobless aid after lackluster April gain MORE leads the Democratic field in a new national poll, followed by Sen. Bernie SandersBernie SandersGOP is consumed by Trump conspiracy theories Manchin on collision course with Warren, Sanders Sanders on Cheney drama: GOP is an 'anti-democratic cult' 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 WarrenDebate over ICBMs: Will 'defund our defenses' be next? Manchin on collision course with Warren, Sanders Hillicon Valley: Broadband companies funded fake net neutrality comments, investigation finds | Twitter rolls out tip feature | Google to adopt 'hybrid work week' MORE (D-Mass.), with 9 percent support, South Bend, Ind., Mayor Pete ButtigiegPete Buttigieg'Funky Academic:' Public has been 'groomed to measure progress by firsts' Biden administration in talks with LA Mayor Eric Garcetti for India ambassador post: reports Business groups target moderate Democrats on Biden tax plans MORE (D), with 6 percent, and former New York City Mayor Michael BloombergMichael BloombergFour years is not enough — Congress should make the child tax credit permanent Biden's spending plans: Good PR, but bad politics and policy Top 12 political donors accounted for almost 1 of every 13 dollars raised since 2009: study 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.