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 BidenSchiff pleads to Senate GOP: 'Right matters. And the truth matters.' Anita Hill to Iowa crowd: 'Statute of limitations' for Biden apology is 'up' Sen. Van Hollen releases documents from GAO investigation MORE and Sen. Bernie SandersBernie SandersBiden, Sanders contend for top place in new national poll Biden leads Democratic primary field nationally: poll Warren calls for Brazil to drop charges against Glenn Greenwald 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 ButtigiegPeter (Pete) Paul ButtigiegBiden, Sanders contend for top place in new national poll Biden leads Democratic primary field nationally: poll Trump to hold rally on eve of New Hampshire primary MORE closely trails at 21 percent, and Sen. Elizabeth WarrenElizabeth Ann WarrenHarris weighing Biden endorsement: report Biden, Sanders contend for top place in new national poll Biden leads Democratic primary field nationally: poll 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 HarrisHarris weighing Biden endorsement: report California Democrat Christy Smith launches first TV ad in bid for Katie Hill's former House seat Steyer spokesperson: 'I don't think necessarily that Tom has bought anything' MORE (D-Calif.) and Amy KlobucharAmy Jean KlobucharHarris weighing Biden endorsement: report Biden leads Democratic primary field nationally: poll CNN cancels next week's Iowa town halls 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.