New poll shows four top-tier 2020 candidates in Iowa

 New poll shows four top-tier 2020 candidates in Iowa
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Iowa voters appear split on the 2020 Democratic presidential primary, according to a new poll that places four candidates within the margin of error for the top spot in the field. 

Former Vice President Joe BidenJoe BidenBiden says Trump executive order is 'a reckless war on Social Security' Trump got into testy exchange with top GOP donor Adelson: report Blumenthal calls for declassification of materials detailing Russian threat to US elections MORE and Sen. Bernie SandersBernie SandersThe Memo: Trump team pounces on Biden gaffes The Hill's Campaign Report: US officials say Russia, China are looking to sow discord in election Warren urges investment in child care workers amid pandemic MORE (I-Vt.) are leading the primary field in the first-in-the country caucus state with 22 percent support each, according to a CBS News-YouGov poll released Sunday. 

South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegCNN's Ana Navarro to host Biden roundtable on making 'Trump a one-term president' Former Indiana Gov. Joe Kernan dies How Republicans can embrace environmentalism and win MORE closely trails at 21 percent, and Sen. Elizabeth WarrenElizabeth WarrenBiden campaign says no VP pick yet after bike trail quip Biden edges closer to VP pick: Here's who's up and who's down Democratic convention lineup to include Ocasio-Cortez, Clinton, Warren: reports MORE’s (D-Mass.) 18 percent also falls within the 4.1 percent margin of error, placing the four candidates in a statistical dead heat for the top spot in Iowa.

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No other candidate registered double-digit support, with Sens. Kamala HarrisKamala Devi HarrisBiden campaign says no VP pick yet after bike trail quip Hillary Clinton roasts NYT's Maureen Dowd over column Biden edges closer to VP pick: Here's who's up and who's down MORE (D-Calif.) and Amy KlobucharAmy KlobucharSenate Democrats demand answers on migrant child trafficking during pandemic Senate Democrats push to include free phone calls for incarcerated people in next relief package Lobbying world MORE (D-Minn.) tied in a distant fifth place with 5 percent each.  

Buttigieg has seen a 15-point uptick since a CBS-YouGov poll of Iowa voters in September that placed him at 6 percent support. 

Sanders’s support has increased 3 points since September, while Warren has seen a 10-point dip and Biden’s support has decreased 3 points in Iowa. 

Buttigieg saw a similar surge in a CNN poll released Saturday that placed him at him at 25 percent support, leading Sanders and Biden by 10 points and Warren by 9 points. 

The new CBS-YouGov poll surveyed 856 registered Democratic voters and was conducted between Nov. 6 and Nov. 13.